TaskUserAssignment matching query does not exist.

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/celery/app/trace.py", line 451, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/sentry_sdk/integrations/celery.py", line 207, in _inner
    reraise(*exc_info)
  File "/usr/local/lib/python3.10/dist-packages/sentry_sdk/_compat.py", line 56, in reraise
    raise value
  File "/usr/local/lib/python3.10/dist-packages/sentry_sdk/integrations/celery.py", line 202, in _inner
    return f(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/celery/app/trace.py", line 734, in __protected_call__
    return self.run(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/aleksis/core/tasks.py", line 69, in send_notification_for_done_task
    assignment = TaskUserAssignment.objects.get(task_result__task_id=task_id)
  File "/usr/local/lib/python3.10/dist-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/usr/local/lib/python3.10/dist-packages/django/db/models/query.py", line 435, in get
    raise self.model.DoesNotExist(
aleksis.core.models.TaskUserAssignment.DoesNotExist: TaskUserAssignment matching query does not exist.