diff --git a/backend/workflow_engine.py b/backend/workflow_engine.py
index 79fdd64..59bf7bf 100644
--- a/backend/workflow_engine.py
+++ b/backend/workflow_engine.py
@@ -423,5 +423,5 @@ def get_execution_order(graph: WorkflowGraph) -> List[str]:
         ['start', 'end']
     """
     engine = WorkflowEngine(graph)
-    # Nutze Validator's topological_order (flattened)
-    return engine.validator.topological_order
+    # Nutze topological_order (flattened)
+    return engine.topological_order