diff --git a/packages/dbgpt-app/src/dbgpt_app/openapi/api_v2.py b/packages/dbgpt-app/src/dbgpt_app/openapi/api_v2.py
index cb3454828..ec8865eb6 100644
--- a/packages/dbgpt-app/src/dbgpt_app/openapi/api_v2.py
+++ b/packages/dbgpt-app/src/dbgpt_app/openapi/api_v2.py
@@ -76,7 +76,7 @@ async def chat_completions(
     """Chat V2 completions
     Args:
         request (ChatCompletionRequestBody): The chat request.
-        flow_service (FlowService): The flow service.
+        service (FlowService): The flow service.
     Raises:
         HTTPException: If the request is invalid.
     """
diff --git a/packages/dbgpt-app/src/dbgpt_app/scene/chat_db/professional_qa/chat.py b/packages/dbgpt-app/src/dbgpt_app/scene/chat_db/professional_qa/chat.py
index 28529ba7b..d5406d6d9 100644
--- a/packages/dbgpt-app/src/dbgpt_app/scene/chat_db/professional_qa/chat.py
+++ b/packages/dbgpt-app/src/dbgpt_app/scene/chat_db/professional_qa/chat.py
@@ -28,19 +28,25 @@ class ChatWithDbQA(BaseChat):
             - select_param:(str) dbname
         """
         self.db_name = chat_param.select_param
+        self.database = None
         self.curr_config = chat_param.real_app_config(ChatWithDBQAConfig)
         super().__init__(chat_param=chat_param, system_app=system_app)
 
+        if self.db_name is None:
+            raise Exception(f"Database: {self.db_name} not found")
         if self.db_name:
             local_db_manager = ConnectorManager.get_instance(self.system_app)
             self.database = local_db_manager.get_connector(self.db_name)
             self.tables = self.database.get_table_names()
-        if self.database.is_graph_type():
+        if self.database is not None and self.database.is_graph_type():
             # When the current graph database retrieves source data from ChatDB, the
             # topk uses the sum of node table and edge table.
             self.top_k = len(list(self.tables))
         else:
-            logger.info(f"Dialect: {self.database.db_type}")
+            logger.info(
+                "Dialect: "
+                f"{self.database.db_type if self.database is not None else None}"
+            )
             self.top_k = self.curr_config.schema_retrieve_top_k
 
     @trace()
diff --git a/packages/dbgpt-serve/src/dbgpt_serve/agent/db/gpts_app.py b/packages/dbgpt-serve/src/dbgpt_serve/agent/db/gpts_app.py
index d898ed0e1..a2cd35eb3 100644
--- a/packages/dbgpt-serve/src/dbgpt_serve/agent/db/gpts_app.py
+++ b/packages/dbgpt-serve/src/dbgpt_serve/agent/db/gpts_app.py
@@ -1391,7 +1391,7 @@ def adapt_native_app_model(dialogue: ConversationVo):
             ChatScene.ChatWithDbQA.value(),
             ChatScene.ChatWithDbExecute.value(),
             ChatScene.ChatDashboard.value(),
-            ChatScene.ChatNormal.value,
+            ChatScene.ChatNormal.value(),
         ]:
             return dialogue
         gpts_dao = GptsAppDao()