diff --git a/FabLabKasse/faucardPayment/FAUcardPaymentThread.py b/FabLabKasse/faucardPayment/FAUcardPaymentThread.py
index eb0a489..e957574 100644
--- a/FabLabKasse/faucardPayment/FAUcardPaymentThread.py
+++ b/FabLabKasse/faucardPayment/FAUcardPaymentThread.py
@@ -579,7 +579,7 @@ def _decrease_balance(self) -> int:
             # if connection lost (1.b)
             if lost:
                 logging.warning("FAUcard: connection lost (1.b)")
-                value = []
+                value: Optional[magpos.LastTransactionResult] = None
                 while lost:
                     lost = False