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Couldn't load context_commit_diffs

Summary

Steps to reproduce

  1. spin up a development server.
  2. go to a merge request and click on "Commits" tab, example /flightjs/Flight/-/merge_requests/3/commits
  3. scroll to bottom and click "Add previously merged commits", select few commits and "Save changes"
  4. click on the "Changes" tab
  5. click on the source dropdown in the compare section and select "previously merged commits"
  6. this should show an error as below

Screenshot_2021-11-14_at_10.01.14_AM

Example Project

any existing project

What is the current bug behavior?

What is the expected correct behavior?

Diff for context commits should load correctly

Relevant logs and/or screenshots

batch diff api call log

Screenshot_2021-11-27_at_12.23.05_PM

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info 

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Possible fixes

It's due to null pointer reference here https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/diff/file_collection/compare.rb#L19