one more if

project/customer/middleware.py

@@ -16,7 +16,7 @@ class ProfileMiddleware(object):
     def process_request(self, request):
         assert hasattr(request, 'user'), "The Profile middleware requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware'."
         request.profile = SimpleLazyObject(lambda: _get_profile(request))
-        if request.user.is_authenticated():
+        if request.user.is_authenticated() and request.session:
             if request.user.profile.user_session_key != request.session.session_key and \
                     request.profile.user_session_key != '':
                 django_logout(request)