diff --git a/sdk/python/ragflow_sdk/modules/document.py b/sdk/python/ragflow_sdk/modules/document.py
index 70c1ac842..c96698079 100644
--- a/sdk/python/ragflow_sdk/modules/document.py
+++ b/sdk/python/ragflow_sdk/modules/document.py
@@ -69,7 +69,7 @@ class Document(Base):
             response = res.json()
             actual_keys = set(response.keys())
             if actual_keys == error_keys:
-                raise Exception(res.get("message"))
+                raise Exception(response.get("message"))
             else:
                 return res.content
         except json.JSONDecodeError:
diff --git a/sdk/python/ragflow_sdk/modules/session.py b/sdk/python/ragflow_sdk/modules/session.py
index 12141afed..d2bbc76e8 100644
--- a/sdk/python/ragflow_sdk/modules/session.py
+++ b/sdk/python/ragflow_sdk/modules/session.py
@@ -80,6 +80,7 @@ class Session(Base):
         
 
     def _structure_answer(self, json_data):
+        answer = ""
         if self.__session_type == "agent":
            answer = json_data["data"]["content"]
         elif self.__session_type == "chat":