Django login 'NoneType' object 没有属性 'append'

Question

Having an issue with Django Allauth. When I log out of one user, and log back in with another, I get this issue, both locally and in production.

I'm using the latest version of Allauth, Django 3.0.5, and Python 3.7.4.

It seems like this is an Allauth issue, but I haven't seen it reported online anywhere else. So just wondering what I can do next to troubleshoot. Login works fine, less I just logged out of another user.

'NoneType' object has no attribute 'append'
Request Method: POST
Request URL:    http://127.0.0.1:8000/account/login/
Django Version: 3.0.5
Exception Type: AttributeError
Exception Value:    
'NoneType' object has no attribute 'append'
Exception Location: /Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py in authentication_failed, line 507
Python Executable:  /Users/[USERDIR]/Sites/frontline/venv/bin/python
Python Version: 3.7.4
Python Path:    
['/Users/[USERDIR]/Sites/frontline',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python37.zip',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/lib-dynload',
 '/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf',
 '/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/odf']
Server time:    Thu, 16 Apr 2020 17:53:52 -0700

Environment:


Request Method: POST
Request URL: http://127.0.0.1:8000/account/login/

Django Version: 3.0.5
Python Version: 3.7.4
Installed Applications:
['django.contrib.admin',
 'django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.humanize',
 'django.contrib.sites',
 'django.contrib.sitemaps',
 'django.contrib.postgres',
 'common',
 'bootstrap4',
 's3direct',
 'bootstrap_datepicker_plus',
 'import_export',
 'tinymce',
 'allauth',
 'allauth.account',
 'allauth.socialaccount',
 'debug_toolbar',
 'dashboard',
 'marketing']
Installed Middleware:
('debug_toolbar.middleware.DebugToolbarMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.security.SecurityMiddleware')



Traceback (most recent call last):
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 34, in inner
    response = get_response(request)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 115, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 113, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 71, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/utils/decorators.py", line 43, in _wrapper
    return bound_method(*args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/decorators/debug.py", line 76, in sensitive_post_parameters_wrapper
    return view(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 138, in dispatch
    return super(LoginView, self).dispatch(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 81, in dispatch
    **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 97, in dispatch
    return handler(request, *args, **kwargs)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/views.py", line 103, in post
    if form.is_valid():
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 180, in is_valid
    return self.is_bound and not self.errors
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 175, in errors
    self.full_clean()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 377, in full_clean
    self._clean_form()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/django/forms/forms.py", line 404, in _clean_form
    cleaned_data = self.clean()
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/forms.py", line 179, in clean
    **credentials)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py", line 497, in authenticate
    self.authentication_failed(request, **credentials)
  File "/Users/[USERDIR]/Sites/frontline/venv/lib/python3.7/site-packages/allauth/account/adapter.py", line 507, in authentication_failed
    data.append(time.mktime(dt.timetuple()))

Exception Type: AttributeError at /account/login/
Exception Value: 'NoneType' object has no attribute 'append'

Answer 1

Put your allauth packages to the top of installed apps and try again. It can be a problem of conflicts since the default django.contrib.auth package is on the top of hierarchy and when django looks through the installed apps, it stops on the first one that matches it's criteria.

Answer 2

Looking at the allauth code ,

def authentication_failed(self, request, **credentials):
  if app_settings.LOGIN_ATTEMPTS_LIMIT:
    cache_key = self._get_login_attempts_cache_key(
      request, **credentials
    )
    data = cache.get(cache_key, [])
    dt = timezone.now()
    data.append(time.mktime(dt.timetuple()))
    cache.set(cache_key, data, app_settings.LOGIN_ATTEMPTS_TIMEOUT)

it seems that for some reason the cache is storing a None value for the login attempts key (note that it's ignoring the default value, [] ). Is the CACHE settings variable set-up correctly ?

Looking around, there seems to be some issues with memcached , if that's what you're using ( Edit: I now think that isn't possible since the Django code just sets the value to the default if the result is None , no matter if it's actually that or the key is not present, due topython-memcached limitations ). This is very strange behavior, you could just deactivate this feature as suggested in the comments, but it seems to be an underlying issue waiting to bite.