When searching Merge Requests with certain parameters, and sorting by Merge Date, there is a 500 raised. Bug: 500 Error when sorting by Merge Date & Milestone Due date, and "approved by" fields Example url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests?approved_by_usernames%5B%5D=marc_shaw&scope=all&sort=merged_at&state=opened Example parameters: > It works for: created date, last updated, popularity, label priority, priority > Fails for: milestone due date, merged date