# Sanic raises "Invalid response type None" error **URL:** \ **Category:** Rasa Open Source\ **Created:** [February 24, 2023, 5:43pm UTC](https://forum.rasa.com/t/sanic-raises-invalid-response-type-none-error/57332 "2023-02-24T17:43:08Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![ScienceGuy](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@ScienceGuy](https://forum.rasa.com/u/ScienceGuy)\ **Post date:** [February 24, 2023, 5:43pm UTC](https://forum.rasa.com/t/sanic-raises-invalid-response-type-none-error/57332/1 "2023-02-24T17:43:08Z")
Hi, I have a setup with Rasa 3.4.0. From today, I receive an error from Sanic: `sanic.exceptions.ServerError: Invalid response type None (need HTTPResponse)` The request was for this url: ```auto ws://rasa-production:5005/socket.io/?transport=websocket&EIO=4&t=1677256668.530688 ``` I could find older posts about such errors, but I am not sure if there is still a bug with the Rasa [socket.io](http://socket.io) connection or if its my code. Where should I look to fix this error? ---
**Author:** ![Isabella69](https://avatars.discourse-cdn.com/v4/letter/i/e480ec/32.png) [@Isabella69](https://forum.rasa.com/u/Isabella69)\ **Post date:** [February 27, 2023, 10:18am UTC](https://forum.rasa.com/t/sanic-raises-invalid-response-type-none-error/57332/2 "2023-02-27T10:18:57Z")
The “Invalid response type None” error in Sanic typically occurs when the handler function returns None instead of a valid response object. ---
**Author:** ![ScienceGuy](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@ScienceGuy](https://forum.rasa.com/u/ScienceGuy)\ **Post date:** [February 27, 2023, 4:20pm UTC](https://forum.rasa.com/t/sanic-raises-invalid-response-type-none-error/57332/3 "2023-02-27T16:20:49Z")
That means there is likely a problem with the response template definiton (e.g. typo)?