Cannot delete project

Hi--

I'm using GitLab CE.

When deleting a specific project, it appears to have deleted (expect from the projects/admin panel), but the project is not getting deleted.

When I check the queue, there is this error:

PG::ForeignKeyViolation: ERROR: update or delete on table "protected_tags" violates foreign key constraint "fk_rails_f7dfda8c51" on table "protected_tag_create_access_levels" DETAIL: Key (id)=(1) is still referenced from table "protected_tag_create_access_levels". : DELETE FROM "projects" WHERE "projects"."id" = $1```

I have tried deleting again via API/token, and I get the same issue.

How can I delete this project?