diff --git a/test/functional/test_framework/test_node.py b/test/functional/test_framework/test_node.py
--- a/test/functional/test_framework/test_node.py
+++ b/test/functional/test_framework/test_node.py
@@ -726,5 +726,5 @@
                 returncode, self.binary, output=cli_stderr)
         try:
             return json.loads(cli_stdout, parse_float=decimal.Decimal)
-        except json.JSONDecodeError:
+        except (json.JSONDecodeError, decimal.InvalidOperation):
             return cli_stdout.rstrip("\n")