diff --git a/qa/rpc-tests/nulldummy.py b/qa/rpc-tests/nulldummy.py
index 6488a9236..54b7eac37 100755
--- a/qa/rpc-tests/nulldummy.py
+++ b/qa/rpc-tests/nulldummy.py
@@ -119,6 +119,8 @@ class NULLDUMMYTest(BitcoinTestFramework):
             node.sendrawtransaction(bytes_to_hex_str(tx.serialize_with_witness()), True)
         except JSONRPCException as exp:
             assert_equal(exp.error["message"], msg)
+        else:
+            assert_equal('', msg)
         return tx.hash