update

app.py

@@ -15,6 +15,8 @@ async def chat_stream_test(
         state_chatbot (Sequence): the chatting history
         request (gr.Request): the request from a user
     """
+    yield (state_chatbot, state_chatbot, disable_btn, disable_btn,
+           '')
     session_id = threading.current_thread().ident
     if request is not None:
         session_id = int(request.kwargs['client']['host'].replace('.', ''))