500 error for search in https://gitlab.com/gitlab-org/gitlab/

Summary

I'm getting a 500 error for the following search: https://gitlab.com/gitlab-org/gitlab/-/issues?scope=all&utf8=%E2%9C%93&state=opened&search=Updating+milestone+fails

Steps to reproduce

1. Go to: https://gitlab.com/gitlab-org/gitlab/-/issues?scope=all&utf8=%E2%9C%93&state=opened&search=Updating+milestone+fails

2. Change the sort order (changing to "Popularity" seems to consistently repro, but it has also happened with other options)

Example Project

(See above.)

What is the current bug behavior?

The search fails with a 500 error.

What is the expected correct behavior?

The search should show the search results.

Relevant logs and/or screenshots

Output of checks

This bug happens on GitLab.com.

Possible fixes

Check the logs and fix the root cause of the 500.