Is your custom action in actions.py correct? Can you show the related code?
With the previous version you must have a required_fields method stating which slots need to be filled and a submit method within your FormAction class.
Yes, it is caused by version 0.11.12. I should not use form{“name”: null} in version 0.11.12, and use required_fields instead of required_slots. Thanks Majian and JoeTorino.