diff --git a/ReportImp/AWOMuensterlandRecklinghausen/Invoicing/CustomInvoiceCreation.cs b/ReportImp/AWOMuensterlandRecklinghausen/Invoicing/CustomInvoiceCreation.cs
index 25b57b10e..23dcb82ae 100644
--- a/ReportImp/AWOMuensterlandRecklinghausen/Invoicing/CustomInvoiceCreation.cs
+++ b/ReportImp/AWOMuensterlandRecklinghausen/Invoicing/CustomInvoiceCreation.cs
@@ -105,7 +105,7 @@ namespace AWOMuensterlandRecklinghausen.Invoicing
 								}
 								else
 								{
-									if (emp.TaxNumber == null)
+									if (emp.TaxNumber == null || emp.TaxNumber == "")
 									{
 										//throw new FaultException<BeWoFault>(new BeWoFault(String.Format("Bei Mitarbeiter*in {0} wurde keine Kostenstelle hinterlegt", emp.Person.FirstNameLastName), BeWoFaultType.CustomWithoutDetails));
 										emp.TaxNumber = "312500";