Cannot access project forks page

Summary

Accessing project forks produces 500.

Steps to reproduce

https://gitlab.com/gitlab-org/gitlab-ce/forks

Relevant logs and/or screenshots

ActionView::Template::Error: undefined method 'title' for nil:NilClass

in app/views/shared/projects/_project.html.haml in block at line 44

Sentry issue: 1180

undefined method 'already_forked?' for nil:NilClass

in app/views/projects/forks/index.html.haml at line 32

Sentry issue: 1178