BugFix: barcodes were not reset while copying to another month

app/lib/actions/monthActions.ts

@@ -52,7 +52,8 @@ export const addMonth = withUser(async (user:AuthenticatedUser, { year, month }:
                     paid: false,
                     attachment: null,
                     notes: null,
-                    payedAmount: null
+                    payedAmount: null,
+                    barcodeImage: undefined,
                 } as Bill
             })
         } as BillingLocation);