diff --git a/BeWo/View/Detail/Accounting/NewGkvAbrechnungPopUpView.xaml.cs b/BeWo/View/Detail/Accounting/NewGkvAbrechnungPopUpView.xaml.cs
index c571ddcd0..a081564c1 100644
--- a/BeWo/View/Detail/Accounting/NewGkvAbrechnungPopUpView.xaml.cs
+++ b/BeWo/View/Detail/Accounting/NewGkvAbrechnungPopUpView.xaml.cs
@@ -277,7 +277,7 @@ namespace BeWo.View.Detail.Accounting
                 FilterStart = new DateTime(FilterEnde.Year, FilterEnde.Month, 1);
             }
 
-            RefreshInvoiceBases(null, (DateTime)e.NewValue);
+            RefreshInvoiceBases();
         }
     }
 }
\ No newline at end of file