While checking that another change didn't break this view, I found that it was already broken. I have not done any real investigation, but my guess would be that it's related to the impacted user account having deleted applications.
1 Traceback (most recent call last): 2 File "/venv/lib/python3.7/site-packages/django/core/handlers/exception.py", line 47, in inner 3 response = get_response(request) 4 File "/venv/lib/python3.7/site-packages/django/core/handlers/base.py", line 181, in _get_response 5 response = wrapped_callback(request, *callback_args, **callback_kwargs) 6 File "/venv/lib/python3.7/site-packages/django/contrib/auth/decorators.py", line 21, in _wrapped_view 7 return view_func(request, *args, **kwargs) 8 File "/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 70, in view 9 return self.dispatch(request, *args, **kwargs) 10 File "/app/TWLight/view_mixins.py", line 151, in dispatch 11 return super(SelfOnly, self).dispatch(request, *args, **kwargs) 12 File "/venv/lib/python3.7/site-packages/django/views/generic/base.py", line 98, in dispatch 13 return handler(request, *args, **kwargs) 14 File "/app/TWLight/users/views.py", line 598, in post 15 return self.delete(request, *args, **kwargs) 16 File "/app/TWLight/users/views.py", line 556, in delete 17 user_app.save() 18 File "/venv/lib/python3.7/site-packages/reversion/revisions.py", line 324, in do_revision_context 19 return func(*args, **kwargs) 20 File "/app/TWLight/applications/models.py", line 175, in save 21 super(Application, self).save(*args, **kwargs) 22 File "/venv/lib/python3.7/site-packages/django/db/models/base.py", line 727, in save 23 force_update=force_update, update_fields=update_fields) 24 File "/venv/lib/python3.7/site-packages/django/db/models/base.py", line 752, in save_base 25 update_fields=update_fields, 26 File "/venv/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 182, in send 27 for receiver in self._live_receivers(sender) 28 File "/venv/lib/python3.7/site-packages/django/dispatch/dispatcher.py", line 182, in <listcomp> 29 for receiver in self._live_receivers(sender) 30 File "/app/TWLight/emails/tasks.py", line 416, in update_app_status_on_save 31 orig_app = Application.objects.get(pk=instance.id) 32 File "/venv/lib/python3.7/site-packages/django/db/models/manager.py", line 85, in manager_method 33 return getattr(self.get_queryset(), name)(*args, **kwargs) 34 File "/venv/lib/python3.7/site-packages/django/db/models/query.py", line 437, in get 35 self.model._meta.object_name 36 37 Exception Type: DoesNotExist at /users/delete_data/<number>/ 38 Exception Value: Application matching query does not exist.