diff --git a/src/bank-lib/bank_api_credit.c b/src/bank-lib/bank_api_credit.c
index 2b437760d..a99b34e26 100644
--- a/src/bank-lib/bank_api_credit.c
+++ b/src/bank-lib/bank_api_credit.c
@@ -151,6 +151,7 @@ handle_history_finished (void *cls,
   switch (response_code)
   {
   case 0:
+    GNUNET_break_op (0);
     ec = TALER_EC_INVALID_RESPONSE;
     break;
   case MHD_HTTP_OK: