diff --git a/metagpt/provider/base_gpt_api.py b/metagpt/provider/base_gpt_api.py
index 59da67d5b..1b1187b72 100644
--- a/metagpt/provider/base_gpt_api.py
+++ b/metagpt/provider/base_gpt_api.py
@@ -45,7 +45,6 @@ class BaseGPTAPI(BaseChatbot):
         format_msgs: Optional[list[dict[str, str]]] = None,
         generator: bool = False,
     ) -> str:
-        message = []
         if system_msgs:
             message = self._system_msgs(system_msgs)
         else: