Consistent 500 errors searching for issues in gitlab-org project

Summary

Gitlab consistently responds with 500 errors when searching the Gitlab-org project filtering on issues.

Steps to reproduce

Firefox 71.0

• https://gitlab.com/search?group_id=9970
  Search for copy file contents
• click Issues

Search redirects to https://gitlab.com/search?group_id=9970&repository_ref=&scope=issues&search=copy+file+contents&snippets= , which always responds with a 500 error

Example Project

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

What is the current bug behavior?

https://gitlab.com/search?group_id=9970&repository_ref=&scope=issues&search=copy+file+contents&snippets= always responds with a 500 error

happens whether logged in or not.

What is the expected correct behavior?

Able to load search results

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com