diff --git a/ConsoleApp3/CardMarketParser.cs b/ConsoleApp3/CardMarketParser.cs
index 7aac4ae..0ccad66 100644
--- a/ConsoleApp3/CardMarketParser.cs
+++ b/ConsoleApp3/CardMarketParser.cs
@@ -79,7 +79,7 @@ namespace CardmarketBot
                     ids.Add(datas[i]);
                 }  
             }
-            catch(OpenQA.Selenium.NotFoundException ex)
+            catch(OpenQA.Selenium.NotFoundException)
             {
                 Console.WriteLine("Keine Verkäufe aktuell");
                 return kunden;
diff --git a/ConsoleApp3/CheckSevDeskPublicList.cs b/ConsoleApp3/CheckSevDeskPublicList.cs
index 711388a..6f16eeb 100644
--- a/ConsoleApp3/CheckSevDeskPublicList.cs
+++ b/ConsoleApp3/CheckSevDeskPublicList.cs
@@ -27,14 +27,14 @@ namespace CardMarketBot
         {
             try
             {
-                SocketShutdown reason = SocketShutdown.Send;
+                //SocketShutdown reason = SocketShutdown.Send;
                 lock (_lock)
                 {
                     BinaryWriter writer = new BinaryWriter(client.GetStream());
                     writer.Write(str);
                     if (_closed)
                     {
-                        reason = SocketShutdown.Both;
+                        //reason = SocketShutdown.Both;
                     }
                 }
                 //client.Client.Shutdown(reason);
@@ -99,7 +99,7 @@ namespace CardMarketBot
 
                 return result == EResult.OK;
             }
-            catch(SocketException e)
+            catch(SocketException)
             {
                 throw new SocketException();
             }
diff --git a/ConsoleApp3/DataContracts/Invoice.cs b/ConsoleApp3/DataContracts/Invoice.cs
index a9ac9f3..11316c9 100644
--- a/ConsoleApp3/DataContracts/Invoice.cs
+++ b/ConsoleApp3/DataContracts/Invoice.cs
@@ -15,14 +15,14 @@ namespace ConsoleApp3.DataContracts
         public int? Id { get; set; }
 
         [JsonProperty(PropertyName = "objectName")]
-        public string ObjectName { get; set; }
+        public string ObjectName { get; set; } = "";
         /// <summary>
         /// 
         /// </summary>
         /// <value></value>
         [DataMember(Name = "invoiceNumber", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "invoiceNumber")]
-        public string InvoiceNumber { get; set; }
+        public string InvoiceNumber { get; set; } = "";
 
         /// <summary>
         /// the contact the invoice belongs to
@@ -30,7 +30,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the contact the invoice belongs to</value>
         [DataMember(Name = "contact", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "contact")]
-        public ModelContact Contact { get; set; }
+        public ModelContact? Contact { get; set; }
 
         /// <summary>
         /// the date the invoice was created
@@ -62,7 +62,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>header/subject of the invoice</value>
         [DataMember(Name = "header", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "header")]
-        public string Header { get; set; }
+        public string Header { get; set; } = "";
 
         /// <summary>
         /// head text of the invoice
@@ -70,7 +70,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>head text of the invoice</value>
         [DataMember(Name = "headText", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "headText")]
-        public string HeadText { get; set; }
+        public string HeadText { get; set; } = "";
 
         /// <summary>
         /// foot text of the invoice
@@ -78,7 +78,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>foot text of the invoice</value>
         [DataMember(Name = "footText", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "footText")]
-        public string FootText { get; set; }
+        public string FootText { get; set; } = "";
 
         /// <summary>
         /// time left for paying the invoice, use format dd.MM.yyyy or number for number of days left
@@ -110,7 +110,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the name in the address, equals the contacts name</value>
         [DataMember(Name = "addressName", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressName")]
-        public string AddressName { get; set; }
+        public string AddressName { get; set; } = "";
 
         /// <summary>
         /// the street in the address, equals the contacts street
@@ -118,7 +118,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the street in the address, equals the contacts street</value>
         [DataMember(Name = "addressStreet", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressStreet")]
-        public string AddressStreet { get; set; }
+        public string AddressStreet { get; set; } = "";
 
         /// <summary>
         /// the zip-code in the address, equals the contacts zip
@@ -126,7 +126,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the zip-code in the address, equals the contacts zip</value>
         [DataMember(Name = "addressZip", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressZip")]
-        public string AddressZip { get; set; }
+        public string AddressZip { get; set; } = "";
 
         /// <summary>
         /// the city in the address, equals the contacts city
@@ -134,7 +134,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the city in the address, equals the contacts city</value>
         [DataMember(Name = "addressCity", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressCity")]
-        public string AddressCity { get; set; }
+        public string AddressCity { get; set; } = "";
 
         /// <summary>
         /// the country in the address, equals the contacts country
@@ -142,7 +142,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the country in the address, equals the contacts country</value>
         [DataMember(Name = "addressCountry", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressCountry")]
-        public ModelStaticCountry AddressCountry { get; set; }
+        public ModelStaticCountry? AddressCountry { get; set; }
 
         /// <summary>
         /// time left for paying the invoice, use format DD.MM.YYYY or number for number of days left
@@ -158,7 +158,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>SevUser who created the invoice</value>
         [DataMember(Name = "createUser", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "createUser")]
-        public ModelSevUser CreateUser { get; set; }
+        public ModelSevUser? CreateUser { get; set; }
 
         /// <summary>
         /// sevClient is the unique id every customer has and is used in nearly all operations
@@ -166,7 +166,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// delivery date of the goods from the invoice, please use dd.MM.yyyy
@@ -182,7 +182,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>status of the invoice</value>
         [DataMember(Name = "status", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "status")]
-        public EInvoiceStatus Status { get; set; }
+        public EInvoiceStatus? Status { get; set; }
 
         /// <summary>
         /// 
@@ -198,7 +198,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>SevUser who created the invoice and therefore is the contact person</value>
         [DataMember(Name = "contactPerson", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "contactPerson")]
-        public ModelSevUser ContactPerson { get; set; } = new ModelSevUser()
+        public ModelSevUser? ContactPerson { get; set; } = new ModelSevUser()
         {
 
         };
@@ -217,7 +217,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>additional text when adding a value added tax regulation</value>
         [DataMember(Name = "taxText", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "taxText")]
-        public string TaxText { get; set; }
+        public string TaxText { get; set; } = "";
 
         /// <summary>
         /// dunning level of the invoice
@@ -233,7 +233,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>name of the contacts address</value>
         [DataMember(Name = "addressParentName", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressParentName")]
-        public string AddressParentName { get; set; }
+        public string AddressParentName { get; set; } = "";
 
         /// <summary>
         /// a reference to the contacts address
@@ -241,7 +241,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>a reference to the contacts address</value>
         [DataMember(Name = "addressContactRef", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressContactRef")]
-        public ModelContactAddress AddressContactRef { get; set; }
+        public ModelContactAddress? AddressContactRef { get; set; }
 
         /// <summary>
         /// 
@@ -249,7 +249,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "taxType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "taxType")]
-        public string TaxType { get; set; }
+        public string TaxType { get; set; } = "";
 
         /// <summary>
         /// 
@@ -257,7 +257,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "paymentMethod", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "paymentMethod")]
-        public ModelPaymentMethod PaymentMethod { get; set; }
+        public ModelPaymentMethod? PaymentMethod { get; set; }
 
         /// <summary>
         /// 
@@ -265,7 +265,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "costCentre", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "costCentre")]
-        public ModelCostCentre CostCentre { get; set; }
+        public ModelCostCentre? CostCentre { get; set; }
 
         /// <summary>
         /// 
@@ -281,7 +281,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "origin", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "origin")]
-        public Object Origin { get; set; }
+        public Object? Origin { get; set; }
 
         /// <summary>
         /// type of the invoice
@@ -289,7 +289,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>type of the invoice</value>
         [DataMember(Name = "invoiceType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "invoiceType")]
-        public string InvoiceType { get; set; }
+        public string InvoiceType { get; set; } = "";
 
         /// <summary>
         /// 
@@ -353,7 +353,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "addressParentName2", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressParentName2")]
-        public string AddressParentName2 { get; set; }
+        public string AddressParentName2 { get; set; } = "";
 
         /// <summary>
         /// 
@@ -361,7 +361,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "addressName2", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressName2")]
-        public string AddressName2 { get; set; }
+        public string AddressName2 { get; set; } = "";
 
         /// <summary>
         /// 
@@ -369,7 +369,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "taxSet", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "taxSet")]
-        public ModelTaxSet TaxSet { get; set; }
+        public ModelTaxSet? TaxSet { get; set; }
 
         /// <summary>
         /// 
@@ -377,7 +377,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "addressGender", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "addressGender")]
-        public string AddressGender { get; set; }
+        public string AddressGender { get; set; } = "";
 
         /// <summary>
         /// 
@@ -393,7 +393,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "address", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "address")]
-        public string Address { get; set; }
+        public string Address { get; set; } = "";
 
         /// <summary>
         /// 
@@ -497,7 +497,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "entryType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "entryType")]
-        public ModelEntryType EntryType { get; set; }
+        public ModelEntryType? EntryType { get; set; }
 
         /// <summary>
         /// 
@@ -505,7 +505,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "costumerInternalNote", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "costumerInternalNote")]
-        public string CostumerInternalNote { get; set; }
+        public string CostumerInternalNote { get; set; } = "";
 
         /// <summary>
         /// 
@@ -530,7 +530,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "sendType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sendType")]
-        public string SendType { get; set; }
+        public string SendType { get; set; } = "";
 
         /// <summary>
         /// 
diff --git a/ConsoleApp3/DataContracts/Invoices.cs b/ConsoleApp3/DataContracts/Invoices.cs
index c8ab436..757a874 100644
--- a/ConsoleApp3/DataContracts/Invoices.cs
+++ b/ConsoleApp3/DataContracts/Invoices.cs
@@ -6,7 +6,7 @@ namespace ConsoleApp3.DataContracts
 {
     internal class Invoices
     {
-        [JsonProperty("objects")] public Invoice[] Invoice { get; set; }
+        [JsonProperty("objects")] public Invoice[]? Invoice { get; set; }
         
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelCategory.cs b/ConsoleApp3/DataContracts/ModelCategory.cs
index a0f49f9..1407046 100644
--- a/ConsoleApp3/DataContracts/ModelCategory.cs
+++ b/ConsoleApp3/DataContracts/ModelCategory.cs
@@ -24,7 +24,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "parent", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "parent")]
-        public ModelCategory Parent { get; set; }
+        public ModelCategory? Parent { get; set; }
 
         /// <summary>
         /// 
@@ -32,7 +32,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// 
@@ -40,7 +40,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "objectType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "objectType")]
-        public string ObjectType { get; set; }
+        public string ObjectType { get; set; } = "";
 
         /// <summary>
         /// 
@@ -56,7 +56,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "code", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "code")]
-        public string Code { get; set; }
+        public string Code { get; set; } = "";
 
         /// <summary>
         /// 
@@ -64,7 +64,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "color", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "color")]
-        public string Color { get; set; }
+        public string Color { get; set; } = "";
 
         /// <summary>
         /// 
@@ -72,7 +72,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// 
@@ -80,7 +80,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "postingAccount", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "postingAccount")]
-        public string PostingAccount { get; set; }
+        public string PostingAccount { get; set; } = "";
 
         /// <summary>
         /// 
@@ -88,7 +88,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "type", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "type")]
-        public string Type { get; set; }
+        public string Type { get; set; } = "";
 
         /// <summary>
         /// 
@@ -96,7 +96,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "translationCode", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "translationCode")]
-        public string TranslationCode { get; set; }
+        public string TranslationCode { get; set; } = "";
 
         /// <summary>
         /// 
@@ -104,7 +104,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "entryType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "entryType")]
-        public ModelEntryType EntryType { get; set; }
+        public ModelEntryType? EntryType { get; set; }
 
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelContact.cs b/ConsoleApp3/DataContracts/ModelContact.cs
index 8dbf856..5fc1319 100644
--- a/ConsoleApp3/DataContracts/ModelContact.cs
+++ b/ConsoleApp3/DataContracts/ModelContact.cs
@@ -19,7 +19,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the contact address</value>
         [DataMember(Name = "address", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "address")]
-        public ModelContactAddress Address { get; set; }
+        public ModelContactAddress? Address { get; set; }
 
         /// <summary>
         /// the creation date of the contact
@@ -43,7 +43,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>name of the contact</value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// status of the contact
@@ -67,7 +67,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "parent", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "parent")]
-        public ModelContact Parent { get; set; }
+        public ModelContact? Parent { get; set; }
 
         /// <summary>
         /// surname of the contact
@@ -75,7 +75,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>surname of the contact</value>
         [DataMember(Name = "surename", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "surename")]
-        public string Surename { get; set; }
+        public string Surename { get; set; } = "";
 
         /// <summary>
         /// family name of the contact
@@ -83,7 +83,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>family name of the contact</value>
         [DataMember(Name = "familyname", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "familyname")]
-        public string Familyname { get; set; }
+        public string Familyname { get; set; } = "";
 
         /// <summary>
         /// title of the contact
@@ -91,7 +91,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>title of the contact</value>
         [DataMember(Name = "titel", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "titel")]
-        public string Titel { get; set; }
+        public string Titel { get; set; } = "";
 
         /// <summary>
         /// category of the contact
@@ -99,7 +99,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>category of the contact</value>
         [DataMember(Name = "category", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "category")]
-        public ModelCategory Category { get; set; }
+        public ModelCategory? Category { get; set; }
 
         /// <summary>
         /// description of the contact
@@ -107,7 +107,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>description of the contact</value>
         [DataMember(Name = "description", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "description")]
-        public string Description { get; set; }
+        public string Description { get; set; } = "";
 
         /// <summary>
         /// any academic title of the contact
@@ -115,7 +115,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>any academic title of the contact</value>
         [DataMember(Name = "academicTitle", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "academicTitle")]
-        public string AcademicTitle { get; set; }
+        public string AcademicTitle { get; set; } = "";
 
         /// <summary>
         /// gender of the contact
@@ -123,7 +123,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>gender of the contact</value>
         [DataMember(Name = "gender", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "gender")]
-        public string Gender { get; set; }
+        public string Gender { get; set; } = "";
 
         /// <summary>
         /// sevClient is the unique id every customer has and is used in nearly all operations
@@ -131,7 +131,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// second name of the contact
@@ -139,7 +139,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>second name of the contact</value>
         [DataMember(Name = "name2", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name2")]
-        public string Name2 { get; set; }
+        public string Name2 { get; set; } = "";
 
         /// <summary>
         /// birthday of the contact
@@ -155,7 +155,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>vat number of the contact</value>
         [DataMember(Name = "vatNumber", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "vatNumber")]
-        public string VatNumber { get; set; }
+        public string VatNumber { get; set; } = "";
 
         /// <summary>
         /// bank account of the contact
@@ -163,7 +163,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>bank account of the contact</value>
         [DataMember(Name = "bankAccount", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "bankAccount")]
-        public string BankAccount { get; set; }
+        public string BankAccount { get; set; } = "";
 
         /// <summary>
         /// bank number of the contact
@@ -171,7 +171,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>bank number of the contact</value>
         [DataMember(Name = "bankNumber", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "bankNumber")]
-        public string BankNumber { get; set; }
+        public string BankNumber { get; set; } = "";
 
         /// <summary>
         /// desired payment method of the customer
@@ -179,7 +179,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>desired payment method of the customer</value>
         [DataMember(Name = "paymentMethod", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "paymentMethod")]
-        public ModelPaymentMethod PaymentMethod { get; set; }
+        public ModelPaymentMethod? PaymentMethod { get; set; }
 
         /// <summary>
         /// 
@@ -187,7 +187,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "entryType", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "entryType")]
-        public ModelEntryType EntryType { get; set; }
+        public ModelEntryType? EntryType { get; set; }
 
         /// <summary>
         /// default cashback time of the contact
@@ -219,7 +219,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>tax number of the contact</value>
         [DataMember(Name = "taxNumber", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "taxNumber")]
-        public string TaxNumber { get; set; }
+        public string TaxNumber { get; set; } = "";
 
         /// <summary>
         /// tax office of the contact
@@ -227,6 +227,6 @@ namespace ConsoleApp3.DataContracts
         /// <value>tax office of the contact</value>
         [DataMember(Name = "taxOffice", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "taxOffice")]
-        public string TaxOffice { get; set; }
+        public string TaxOffice { get; set; } = "";
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelContactAddress.cs b/ConsoleApp3/DataContracts/ModelContactAddress.cs
index 58ad3b7..b4eebe4 100644
--- a/ConsoleApp3/DataContracts/ModelContactAddress.cs
+++ b/ConsoleApp3/DataContracts/ModelContactAddress.cs
@@ -28,7 +28,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>the contact the address belongs to</value>
         [DataMember(Name = "contact", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "contact")]
-        public ModelContact Contact { get; set; }
+        public ModelContact? Contact { get; set; }
 
         /// <summary>
         /// 
@@ -36,7 +36,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "street", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "street")]
-        public string Street { get; set; }
+        public string Street { get; set; } = "";
 
         /// <summary>
         /// zip of the city/village
@@ -44,7 +44,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>zip of the city/village</value>
         [DataMember(Name = "zip", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "zip")]
-        public string Zip { get; set; }
+        public string Zip { get; set; } = "";
 
         /// <summary>
         /// 
@@ -52,7 +52,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "city", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "city")]
-        public string City { get; set; }
+        public string City { get; set; } = "";
 
         /// <summary>
         /// 
@@ -60,7 +60,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "country", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "country")]
-        public ModelStaticCountry Country { get; set; }
+        public ModelStaticCountry? Country { get; set; }
 
         /// <summary>
         /// category of the address
@@ -68,7 +68,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>category of the address</value>
         [DataMember(Name = "category", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "category")]
-        public ModelCategory Category { get; set; }
+        public ModelCategory? Category { get; set; }
 
         /// <summary>
         /// 
@@ -76,7 +76,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// sevClient is the unique id every customer has and is used in nearly all operations
@@ -84,7 +84,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object SevClient { get; set; } = new object();
 
         /// <summary>
         /// 
@@ -92,7 +92,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name2", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name2")]
-        public string Name2 { get; set; }
+        public string Name2 { get; set; } = "";
 
         /// <summary>
         /// 
@@ -100,7 +100,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name3", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name3")]
-        public string Name3 { get; set; }
+        public string Name3 { get; set; } = "";
 
         /// <summary>
         /// 
@@ -108,7 +108,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name4", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name4")]
-        public string Name4 { get; set; }
+        public string Name4 { get; set; } = "";
 
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelCostCentre.cs b/ConsoleApp3/DataContracts/ModelCostCentre.cs
index b5877ac..45c7f55 100644
--- a/ConsoleApp3/DataContracts/ModelCostCentre.cs
+++ b/ConsoleApp3/DataContracts/ModelCostCentre.cs
@@ -25,7 +25,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// 
@@ -33,7 +33,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "number", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "number")]
-        public string Number { get; set; }
+        public string Number { get; set; } = "";
 
         /// <summary>
         /// 
@@ -41,7 +41,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// 
@@ -49,7 +49,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "color", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "color")]
-        public string Color { get; set; }
+        public string Color { get; set; } = "";
 
         /// <summary>
         /// 
@@ -57,6 +57,6 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "postingAccount", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "postingAccount")]
-        public string PostingAccount { get; set; }
+        public string PostingAccount { get; set; } = "";
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelEntryType.cs b/ConsoleApp3/DataContracts/ModelEntryType.cs
index 544494d..c56728f 100644
--- a/ConsoleApp3/DataContracts/ModelEntryType.cs
+++ b/ConsoleApp3/DataContracts/ModelEntryType.cs
@@ -24,7 +24,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// 
@@ -32,6 +32,6 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelPaymentMethod.cs b/ConsoleApp3/DataContracts/ModelPaymentMethod.cs
index 6d87dc0..5b00f12 100644
--- a/ConsoleApp3/DataContracts/ModelPaymentMethod.cs
+++ b/ConsoleApp3/DataContracts/ModelPaymentMethod.cs
@@ -28,7 +28,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// 
@@ -36,7 +36,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// 
@@ -44,7 +44,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "text", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "text")]
-        public string Text { get; set; }
+        public string Text { get; set; } = "";
 
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelRechnung.cs b/ConsoleApp3/DataContracts/ModelRechnung.cs
index 72d7d35..f95dfc0 100644
--- a/ConsoleApp3/DataContracts/ModelRechnung.cs
+++ b/ConsoleApp3/DataContracts/ModelRechnung.cs
@@ -13,10 +13,10 @@ namespace ConsoleApp3.DataContracts
     {
         [DataMember(Name = "invoice", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "invoice")]
-        public Invoice Invoice { get; set; }
+        public Invoice? Invoice { get; set; }
 
         [DataMember(Name = "invoicePosSave", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "invoicePosSave")]
-        public InvoicePosSave[] InvoicePosSaves { get; set; }
+        public InvoicePosSave[]? InvoicePosSaves { get; set; }
     }
 }
diff --git a/ConsoleApp3/DataContracts/ModelSevUser.cs b/ConsoleApp3/DataContracts/ModelSevUser.cs
index 87c8bd1..5178edf 100644
--- a/ConsoleApp3/DataContracts/ModelSevUser.cs
+++ b/ConsoleApp3/DataContracts/ModelSevUser.cs
@@ -21,6 +21,6 @@ namespace ConsoleApp3.DataContracts
         /// <value>This information is not visible for you</value>
         [DataMember(Name = "hidden", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "hidden")]
-        public string Hidden { get; set; }
+        public string Hidden { get; set; } = "";
     }
 }
\ No newline at end of file
diff --git a/ConsoleApp3/DataContracts/ModelStaticCountry.cs b/ConsoleApp3/DataContracts/ModelStaticCountry.cs
index 8cb127c..337ca73 100644
--- a/ConsoleApp3/DataContracts/ModelStaticCountry.cs
+++ b/ConsoleApp3/DataContracts/ModelStaticCountry.cs
@@ -20,7 +20,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "code", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "code")]
-        public string Code { get; set; }
+        public string Code { get; set; } = "";
 
         /// <summary>
         /// 
@@ -28,7 +28,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "name", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "name")]
-        public string Name { get; set; }
+        public string Name { get; set; } = "";
 
         /// <summary>
         /// 
@@ -36,7 +36,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "nameEn", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "nameEn")]
-        public string NameEn { get; set; }
+        public string NameEn { get; set; } = "";
 
         /// <summary>
         /// 
@@ -44,7 +44,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "translationCode", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "translationCode")]
-        public string TranslationCode { get; set; }
+        public string TranslationCode { get; set; } = "";
 
         /// <summary>
         /// 
@@ -52,7 +52,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "locale", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "locale")]
-        public string Locale { get; set; }
+        public string Locale { get; set; } = "";
 
         /// <summary>
         /// 
diff --git a/ConsoleApp3/DataContracts/ModelTaxSet.cs b/ConsoleApp3/DataContracts/ModelTaxSet.cs
index 30ddfb1..6debc33 100644
--- a/ConsoleApp3/DataContracts/ModelTaxSet.cs
+++ b/ConsoleApp3/DataContracts/ModelTaxSet.cs
@@ -29,7 +29,7 @@ namespace ConsoleApp3.DataContracts
         /// <value>sevClient is the unique id every customer has and is used in nearly all operations</value>
         [DataMember(Name = "sevClient", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "sevClient")]
-        public Object SevClient { get; set; }
+        public Object? SevClient { get; set; }
 
         /// <summary>
         /// 
@@ -37,7 +37,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "text", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "text")]
-        public string Text { get; set; }
+        public string Text { get; set; } = "";
 
         /// <summary>
         /// 
@@ -61,7 +61,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "displayText", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "displayText")]
-        public string DisplayText { get; set; }
+        public string DisplayText { get; set; } = "";
 
         /// <summary>
         /// 
@@ -69,7 +69,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "vatReportFieldNet", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "vatReportFieldNet")]
-        public string VatReportFieldNet { get; set; }
+        public string VatReportFieldNet { get; set; } = "";
 
         /// <summary>
         /// 
@@ -77,7 +77,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "vatReportFieldTax", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "vatReportFieldTax")]
-        public string VatReportFieldTax { get; set; }
+        public string VatReportFieldTax { get; set; } = "";
 
         /// <summary>
         /// 
@@ -85,7 +85,7 @@ namespace ConsoleApp3.DataContracts
         /// <value></value>
         [DataMember(Name = "accountingExportVatField", EmitDefaultValue = false)]
         [JsonProperty(PropertyName = "accountingExportVatField")]
-        public string AccountingExportVatField { get; set; }
+        public string AccountingExportVatField { get; set; } = "";
 
         /// <summary>
         /// 
diff --git a/ConsoleApp3/InvoiceParser.cs b/ConsoleApp3/InvoiceParser.cs
index e3e2173..f06de07 100644
--- a/ConsoleApp3/InvoiceParser.cs
+++ b/ConsoleApp3/InvoiceParser.cs
@@ -54,6 +54,7 @@ namespace CardmarketBot
             // 3 => Österreich
             // 6 => Belgien
             // 11 => Frankreich
+            // 13 => Irland
             // 14 => Italien
             // 17 => Luxemburg
 
@@ -65,6 +66,7 @@ namespace CardmarketBot
                 { "Belgien",6 },
                 { "Dänemark", 8 },
                 { "Frankreich", 11 },
+                { "Irland", 13 },
                 { "Italien", 14 },
                 { "Luxemburg", 17 }
             };
diff --git a/ConsoleApp3/Kunde.cs b/ConsoleApp3/Kunde.cs
index fe56a1c..51554d3 100644
--- a/ConsoleApp3/Kunde.cs
+++ b/ConsoleApp3/Kunde.cs
@@ -29,6 +29,7 @@ class Kunde
         get => overrideVersandskosten;
         set
         {
+            if (value == null) return;
             string[] parts = value.Split(' ');
             if(parts.Length < 2)
             {
diff --git a/ConsoleApp3/Program.cs b/ConsoleApp3/Program.cs
index 84dbb41..cab7949 100644
--- a/ConsoleApp3/Program.cs
+++ b/ConsoleApp3/Program.cs
@@ -38,6 +38,7 @@ namespace CardmarketBot
 
             foreach (ModelRechnung item in rechnungen)
             {
+                if(item.Invoice == null) continue;
                 var str_header = item.Invoice.Header;
                 if (str_header != null)
                 {
diff --git a/ConsoleApp3/SevdeskService.cs b/ConsoleApp3/SevdeskService.cs
index 86f16a5..81a0182 100644
--- a/ConsoleApp3/SevdeskService.cs
+++ b/ConsoleApp3/SevdeskService.cs
@@ -26,7 +26,7 @@ namespace CardmarketBot
        
         public async void Create(ModelRechnung rechnung)
         {
-
+            if (rechnung.Invoice == null) return;
             rechnung.Invoice.InvoiceNumber = string.Format("RE-{0}", await GetNextInvoiceNumber());
             await WriteInv(rechnung);
         }
@@ -60,7 +60,9 @@ namespace CardmarketBot
             {
                 MissingMemberHandling = MissingMemberHandling.Ignore
             };
+#pragma warning disable CS8603 // Mögliche Nullverweisrückgabe.
             return JsonConvert.DeserializeObject<Invoices>(contents, jsonSerializerSettings);
+#pragma warning restore CS8603 // Mögliche Nullverweisrückgabe.
         }
 
         private async Task<string> GetNextInvoiceNumber()
@@ -76,6 +78,8 @@ namespace CardmarketBot
             };
             var ob = JsonConvert.DeserializeObject<RNumbers>(contents, jsonSerializerSettings);
 
+            if (ob == null) return "";
+            if (ob.ConfigRechnungsnummer == null) return "";
             return ob.ConfigRechnungsnummer.NextNumber;
             
         }
@@ -84,7 +88,7 @@ namespace CardmarketBot
     [DataContract]
     class RNumbers
     {
-        [JsonProperty("objects")] public ConfigRechnungnummer ConfigRechnungsnummer { get; set; }
+        [JsonProperty("objects")] public ConfigRechnungnummer? ConfigRechnungsnummer { get; set; }
     }
 
     [DataContract]
diff --git a/ConsoleApp3/test_BRIEF085.csv b/ConsoleApp3/test_BRIEF085.csv
new file mode 100644
index 0000000..2f3b55f
--- /dev/null
+++ b/ConsoleApp3/test_BRIEF085.csv
@@ -0,0 +1,6 @@
+NAME;ZUSATZ;STRASSE;NUMMER;PLZ;STADT;LAND;ADRESS_TYP;REFERENZ
+W&W TECH UG;Lukas Winkelmann;Schwedenschanze;70;49808;LINGEN;DEU;HOUSE
+Pierre KOch;;Zum Kuckeshof;22;47239;Duisburg;DEU;HOUSE;1122664505
+Yunus Elitok;;Heckteichstraße;13;40627;Düsseldorf;DEU;HOUSE;1122677794
+Dennis Wolf;;Edelherr-Ludolf-Ring;13;48432;Rheine;DEU;HOUSE;1122347599
+Corin Repina;;Richard-Wagner-Str.;47;78224;Singen;DEU;HOUSE;1122723098
diff --git a/ConsoleApp3/test_BRIEF100.csv b/ConsoleApp3/test_BRIEF100.csv
new file mode 100644
index 0000000..14034e3
--- /dev/null
+++ b/ConsoleApp3/test_BRIEF100.csv
@@ -0,0 +1,3 @@
+NAME;ZUSATZ;STRASSE;NUMMER;PLZ;STADT;LAND;ADRESS_TYP;REFERENZ
+W&W TECH UG;Lukas Winkelmann;Schwedenschanze;70;49808;LINGEN;DEU;HOUSE
+Bastian Himmel;;Heinrich-Rau-Straße;17;16816;Neuruppin;DEU;HOUSE;1122659468
diff --git a/ConsoleApp3/test_FAILED.csv b/ConsoleApp3/test_FAILED.csv
new file mode 100644
index 0000000..c975a6c
--- /dev/null
+++ b/ConsoleApp3/test_FAILED.csv
@@ -0,0 +1,3 @@
+NAME;ZUSATZ;STRASSE;NUMMER;PLZ;STADT;LAND;ADRESS_TYP;REFERENZ
+W&W TECH UG;Lukas Winkelmann;Schwedenschanze;70;49808;LINGEN;DEU;HOUSE
+Alan Hoban;;9 Kings Hall Phibsboro;Road;D07KX07;Dublin,;DEU;HOUSE;1122708517
diff --git a/ConsoleApp3/test_PRIO210.csv b/ConsoleApp3/test_PRIO210.csv
new file mode 100644
index 0000000..62ce19a
--- /dev/null
+++ b/ConsoleApp3/test_PRIO210.csv
@@ -0,0 +1,3 @@
+NAME;ZUSATZ;STRASSE;NUMMER;PLZ;STADT;LAND;ADRESS_TYP;REFERENZ
+W&W TECH UG;Lukas Winkelmann;Schwedenschanze;70;49808;LINGEN;DEU;HOUSE
+Torben Clewinig;;Goslarer Straße;79;70499;Stuttgart;DEU;HOUSE;1122380365