single merge request is always showing 500 error

Summary

This merge request that was merged years ago always shows a 500 Error page for multiple users, either logged in or not: fdroid/fdroidserver!43 (closed)

Steps to reproduce

click the link: fdroid/fdroidserver!43 (closed)

What is the current bug behavior?

Always see a 500 Error

What is the expected correct behavior?

See the merge request.

Results of GitLab environment info

gitlab.com