Hi,

This sounds like you have incompatible versions of some libraries installed. Can you tell us what versions you have installed? Specifically django and django-allauth?

Thanks for the hint, this caused the issue:

python-django-allauth/stretch-backports,now 0.35.0-1~bpo9+2 all [installed,automatic] python-django/stable,now 1:1.10.7-2 all [installed,automatic]

With python-django from backports the issue does not appear.

Also when posting django settings be careful because it contains secrets that you should change now:

• SECRET_KEY
• Mailman credentials
• Database credentials

Oh, I just cared of the database credentials while pasting it, changed.

What I find a little strange is that all your middleware classes are commented out in the settings you sent. That doesn't look right...

This was just a test if it would fix something.

Kind regards Bjoern Franke