Required Slot in Form Action

Hi All,

I am filling slots from Custom actions and after that to verify if bot have filled all the slots I am using FormAction but because all the slots are already filled FormAction does not work. It shows TypeError: 'NoneType' object is not iterable in action but when I use FormAction directly without filling those slots from other custom action it works but as I said earlier I want to fill slots from custom action first(because of Internal API calling) not directly from FormAction(can’t make dynamic buttons i.e. can’t call API in domain.yml). Can anyone help me with this?