IntegrityError: duplicate key value violates unique constraint "website_project_slug_key"

[sentry-io]

Sentry Issue: BLT-DJANGO-QM

Project.DoesNotExist: Project matching query does not exist.
  File "django/db/models/query.py", line 948, in get_or_create
    return self.get(**kwargs), False
  File "django/db/models/query.py", line 649, in get
    raise self.model.DoesNotExist(

UniqueViolation: duplicate key value violates unique constraint "website_project_slug_key"
DETAIL:  Key (slug)=(owasp-masvs) already exists.

  File "django/db/backends/utils.py", line 105, in _execute
    return self.cursor.execute(sql, params)

IntegrityError: duplicate key value violates unique constraint "website_project_slug_key"
DETAIL:  Key (slug)=(owasp-masvs) already exists.

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  File "website/views/project.py", line 273, in post
    project, created = Project.objects.get_or_create(