diff --git a/api/core/completion.py b/api/core/completion.py
index 755f376c2..486a3b725 100644
--- a/api/core/completion.py
+++ b/api/core/completion.py
@@ -388,7 +388,6 @@ And answer according to the language of the user's question.
             pre_prompt=pre_prompt,
             query=message.query,
             inputs=message.inputs,
-            chain_output=None,
             agent_execute_result=None,
             memory=None
         )