Rasa ERROR asyncio - Task exception was never retrieved

[InnoOmnia]

@InnoOmnia

2021-09-08 14:06:20 DEBUG    rasa.core.lock_store  - Deleted lock for conversation 'ccb46afa541447fda34f1f87b7954ca2'.
2021-09-08 14:06:20 ERROR    asyncio  - Task exception was never retrieved
future: <Task finished coro=<AsyncServer._handle_event_internal() done, defined at /opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py:475> exception=AttributeError("'NoneType' object has no attribute 'strip'") created at /opt/venv/lib/python3.7/site-packages/engineio/asyncio_server.py:322>
source_traceback: Object created at (most recent call last):
  File "/opt/venv/bin/rasa", line 8, in <module>
    sys.exit(main())
  File "/opt/venv/lib/python3.7/site-packages/rasa/__main__.py", line 116, in main
    cmdline_arguments.func(cmdline_arguments)
  File "/opt/venv/lib/python3.7/site-packages/rasa/cli/run.py", line 90, in run
    rasa.run(**vars(args))
  File "/opt/venv/lib/python3.7/site-packages/rasa/run.py", line 57, in run
    **kwargs,
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/run.py", line 226, in serve_application
    workers=number_of_workers,
  File "/opt/venv/lib/python3.7/site-packages/sanic/app.py", line 1170, in run
    serve(**server_settings)
  File "/opt/venv/lib/python3.7/site-packages/sanic/server.py", line 856, in serve
    loop.run_forever()
  File "/opt/venv/lib/python3.7/site-packages/spf/framework.py", line 555, in _handle_request
    stream_callback)
  File "/opt/venv/lib/python3.7/site-packages/sanic/app.py", line 973, in handle_request
    response = await response
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_server.py", line 251, in handle_request
    packets = await socket.handle_get_request(environ)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_socket.py", line 93, in handle_get_request
    return await getattr(self, '_upgrade_' + transport)(environ)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_socket.py", line 136, in _upgrade_websocket
    return await ws(environ)
  File "/opt/venv/lib/python3.7/site-packages/engineio/async_drivers/sanic.py", line 122, in __call__
    await self.handler(self)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_socket.py", line 228, in _websocket_handler
    await self.receive(pkt)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_socket.py", line 47, in receive
    run_async=self.server.async_handlers)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_server.py", line 423, in _trigger_event
    ret = await self.handlers[event](*args)
  File "/opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py", line 543, in _handle_eio_message
    await self._handle_event(sid, pkt.namespace, pkt.id, pkt.data)
  File "/opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py", line 471, in _handle_event
    data, namespace, id)
  File "/opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py", line 373, in start_background_task
    return self.eio.start_background_task(target, *args, **kwargs)
  File "/opt/venv/lib/python3.7/site-packages/engineio/asyncio_server.py", line 322, in start_background_task
    return asyncio.ensure_future(target(*args, **kwargs))
Traceback (most recent call last):
  File "/opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py", line 476, in _handle_event_internal
    r = await server._trigger_event(data[0], namespace, sid, *data[1:])
  File "/opt/venv/lib/python3.7/site-packages/socketio/asyncio_server.py", line 504, in _trigger_event
    ret = await self.handlers[namespace][event](*args)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/channels/socketio.py", line 217, in handle_message
    await on_new_message(message)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/channels/channel.py", line 85, in handler
    await app.agent.handle_message(*args, **kwargs)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/agent.py", line 528, in handle_message
    return await processor.handle_message(message)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/processor.py", line 99, in handle_message
    await self._predict_and_execute_next_action(message.output_channel, tracker)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/processor.py", line 632, in _predict_and_execute_next_action
    action, tracker, output_channel, self.nlg, prediction
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/processor.py", line 776, in _run_action
    await self.execute_side_effects(events, tracker, output_channel)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/processor.py", line 671, in execute_side_effects
    await self._send_bot_messages(events, tracker, output_channel)
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/processor.py", line 687, in _send_bot_messages
    await output_channel.send_response(tracker.sender_id, e.message())
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/channels/channel.py", line 183, in send_response
    recipient_id, message.pop("text"), message.pop("buttons"), **message
  File "/opt/venv/lib/python3.7/site-packages/rasa/core/channels/socketio.py", line 68, in send_text_with_buttons
    message_parts = text.strip().split("\n\n") or [text]
AttributeError: 'NoneType' object has no attribute 'strip'

Here is the case when using shell, bot works and button is showed

2021-09-09 07:58:57 DEBUG    rasa.core.processor  - Predicted next action 'action_session_start' with confidence 1.00.
2021-09-09 07:58:57 DEBUG    rasa.core.processor  - Policy prediction ended with events '[]'.
2021-09-09 07:58:57 DEBUG    rasa.core.processor  - Action 'action_session_start' ended with events '[<rasa.shared.core.events.SessionStarted object at 0x7fc6f43f9a50>, ActionExecuted(action: action_listen, policy: None, confidence: None)]'.
2021-09-09 07:58:57 DEBUG    rasa.core.processor  - Current slot values:
        vastaus01: None
        vastaus02: None
        vastaus03: None
        vastaus04: None
        vastaus05: None
        requested_slot: None
2021-09-09 07:58:57 DEBUG    rasa.core.lock_store  - Deleted lock for conversation '3e899e3b2b2442baa77d4d8b498d35f5'.
? None  (Use arrow keys)
 » 1: jatka (/kysymys01_vaarin)
   Type out your own message...