diff --git a/planemo/runnable.py b/planemo/runnable.py
index 9e69d7bec..9c7bb507c 100644
--- a/planemo/runnable.py
+++ b/planemo/runnable.py
@@ -597,7 +597,7 @@ def get_output(self, output_id):
 
     def structured_data(self, test_case: Optional[TestCase] = None) -> Dict[str, Any]:
         output_problems = []
-        if isinstance(self, SuccessfulRunResponse) and self.was_successful:
+        if self.was_successful:
             execution_problem = None
             if test_case:
                 for output_id, output_test in test_case.output_expectations.items():