diff --git a/dbgpt/core/awel/flow/flow_factory.py b/dbgpt/core/awel/flow/flow_factory.py
index 3bd9c7b93..0ae260ce7 100644
--- a/dbgpt/core/awel/flow/flow_factory.py
+++ b/dbgpt/core/awel/flow/flow_factory.py
@@ -558,7 +558,7 @@ def _topological_sort(
             if in_degree[adjacent] == 0:
                 queue.append(adjacent)
 
-    if len(key_to_order) != len(keys):
+    if current_order != len(keys):
         raise ValueError("Graph has at least one cycle")
 
     return key_to_order