diff --git a/Service/DCEntityMapper/InvoiceBaseDC_InvoiceBase.cs b/Service/DCEntityMapper/InvoiceBaseDC_InvoiceBase.cs
index 186ee1148..20f275717 100644
--- a/Service/DCEntityMapper/InvoiceBaseDC_InvoiceBase.cs
+++ b/Service/DCEntityMapper/InvoiceBaseDC_InvoiceBase.cs
@@ -143,16 +143,24 @@ namespace BeWo.Service.DCEntityMapper
 
             if(customer is object)
 			{
-                pDataContract.CustomerOid = customer.Oid.Value;
-                pDataContract.CustomerFirstName = customer.Person.FirstName;
-                pDataContract.CustomerLastName = customer.Person.LastName;
+                try
+                {
+					pDataContract.CustomerOid = customer.Oid.Value;
+					pDataContract.CustomerFirstName = customer.Person.FirstName;
+					pDataContract.CustomerLastName = customer.Person.LastName;
 
-                var error = GkvValidator.ValidateCustomer(customer.InsuranceNumber, customer.VersichertenStatus);
-                if (error is null)
-                    error = GkvValidator.ValidateInvoiceBase(pDataContract);
+					var error = GkvValidator.ValidateCustomer(customer.InsuranceNumber, customer.VersichertenStatus);
+					if (error is null)
+						error = GkvValidator.ValidateInvoiceBase(pDataContract);
 
-				pDataContract.IsGkvValidError = error;
-                pDataContract.IsGkvValid = error is null;
+					pDataContract.IsGkvValidError = error;
+					pDataContract.IsGkvValid = error is null;
+				}
+                catch (Exception e)
+                {
+					pDataContract.IsGkvValidError = e.ToString();
+					pDataContract.IsGkvValid = false;
+				}
             }
 
             pDataContract.XRechnungStoredFile = MapperFactory.StoredFile.CreateOrMapToNewDC(pEntity.XRechnungStoredFile, true);