Sentry shows a large amount of Cannot read properties of null (reading 'mergeRequest')

Description

A large number of errors started being reported around May 23rd due to Cannot read properties of null (reading 'mergeRequest')

Error: https://new-sentry.gitlab.net/organizations/gitlab/issues/173370/?environment=gprd&project=4&referrer=issue-stream&sort=freq&statsPeriod=24h

Details

Unfortunately, a sourcemap is not currently available to pinpoint the exact source, but I suspect is a relatively new change (as the errors appear since 23rd).

All of the occurrences are at the page: projects:merge_requests:show