Pull request does not exists anymore but is still listed in pull requests page

I got a pull request and looks like its repository does not exists anymore, but it is still there as a "Open pull request":

https://bitbucket.org/semente/django-ibge/pull-requests\\
https://bitbucket.org/semente/django-ibge/pull-request/2/adding-the-slug-field-and-migrations-files