'bool' object is not callable - message/fields.py in clean - Django Version: 3.0.8 - Python: 3.7.8

[ghost]

Hi guys,

Thanks for this app 👍 that really nice.
I cloned it and I got an error when I send a new message (compose views). It works for the reply views.
Just change recipient to receiver :)

'bool' object is not callable:

if receiver_filter(r) is False:

receiver_filter = self._receiver_filter
        invalid_users = []
        if receiver_filter is not None:
            for r in users:
                if receiver_filter(r) is False:
                    users.remove(r)
                    invalid_users.append(getattr(r, get_username_field()))

        if unknown_names or invalid_users:
            raise forms.ValidationError(_(u"The following usernames are incorrect: %(users)s") % {'users': ', '.join(list(unknown_names)+invalid_users)})

Does anyone has an idea