Step to reproduce this bug:
$ git clone https://github.com/pdonadeo/suit_bug.git$ cd suit_bug$ mkvirtualenv suit_bug$ pip install --upgrade pip$ pip install -r requiremets.txt$ ./manage.py makemigrations$ ./manage.py migrate$ ./manage.py collectstatic$ ./manage.py createsuperuser$ ./manage.py loaddata my_app/fixtures/data.json$ ./manage.py runserver
Now open http://127.0.0.1:8000/admin/ and log in with the supersuser jou just created.