"Something went wrong on our end" when viewing merge request changes

Most of the time the Merge Request --> Compare feature works fine, but for one particular branch of ours we get the “Something went wrong on our end” error message. Digging through logs I found this in /var/log/gitlab/gitlab-rails/production.log. Is this the appropriate place to post this? Should I open an issue on the issue tracker? I’m using the free community edition so I didn’t know if that would be appropriate.

Blockquote
Completed 500 Internal Server Error in 175ms (ActiveRecord: 23.5ms)
ActionView::Template::Error (121…121 out of range):
1: - environment = local_assigns.fetch(:environment, nil)
2: - show_whitespace_toggle = local_assigns.fetch(:show_whitespace_toggle, true)
3: - can_create_note = !@diff_notes_disabled && can?(current_user, :create_note, diffs.project)
4: - diff_files = diffs.diff_files
5: - merge_request = local_assigns.fetch(:merge_request, false)
6:
7: .content-block.oneline-block.files-changed.diff-files-changed.js-diff-files-changed{ class: (“diff-files-changed-merge-request” if merge_request) }
lib/gitlab/string_range_marker.rb:39:in []=' lib/gitlab/string_range_marker.rb:39:in block in mark’
lib/gitlab/string_range_marker.rb:33:in each' lib/gitlab/string_range_marker.rb:33:in each_with_index’
lib/gitlab/string_range_marker.rb:33:in mark' lib/gitlab/diff/inline_diff_marker.rb:5:in mark’
lib/gitlab/diff/highlight.rb:29:in block in highlight' lib/gitlab/diff/highlight.rb:21:in map’
lib/gitlab/diff/highlight.rb:21:in with_index' lib/gitlab/diff/highlight.rb:21:in highlight’
lib/gitlab/diff/file.rb:129:in highlighted_diff_lines' lib/gitlab/diff/file_collection/merge_request_diff.rb:52:in cache_highlight!’
lib/gitlab/diff/file_collection/merge_request_diff.rb:28:in decorate_diff!' lib/gitlab/diff/file_collection/base.rb:25:in block in diff_files’
lib/gitlab/git/diff_collection.rb:85:in block in decorate!' lib/gitlab/git/diff_collection.rb:150:in block in each_rugged_patch’
lib/gitlab/git/diff_collection.rb:124:in each' lib/gitlab/git/diff_collection.rb:124:in each_rugged_patch’
lib/gitlab/git/diff_collection.rb:49:in block in each' lib/gitlab/gitaly_client.rb:232:in block (2 levels) in migrate’
lib/gitlab/gitaly_client.rb:274:in allow_n_plus_1_calls' lib/gitlab/gitaly_client.rb:227:in block in migrate’
lib/gitlab/metrics/influx_db.rb:95:in measure' lib/gitlab/gitaly_client.rb:225:in migrate’
lib/gitlab/git/diff_collection.rb:45:in each' lib/gitlab/git/diff_collection.rb:84:in each_with_index’
lib/gitlab/git/diff_collection.rb:84:in decorate!' lib/gitlab/diff/file_collection/base.rb:25:in diff_files’
lib/gitlab/diff/file_collection/merge_request_diff.rb:16:in diff_files' app/views/projects/diffs/_diffs.html.haml:4:in _app_views_projects_diffs__diffs_html_haml___2936660900574289108_70293681188740’
app/views/projects/merge_requests/diffs/_diffs.html.haml:18:in _app_views_projects_merge_requests_diffs__diffs_html_haml___4299823640361657915_70293654431520' app/controllers/application_controller.rb:246:in view_to_html_string’
app/controllers/projects/merge_requests/diffs_controller.rb:14:in show' lib/gitlab/i18n.rb:47:in with_locale’
lib/gitlab/i18n.rb:53:in with_user_locale' app/controllers/application_controller.rb:324:in set_locale’
lib/gitlab/middleware/multipart.rb:93:in call' lib/gitlab/request_profiler/middleware.rb:14:in call’
lib/gitlab/middleware/go.rb:18:in call' lib/gitlab/etag_caching/middleware.rb:11:in call’
lib/gitlab/middleware/read_only.rb:31:in call' lib/gitlab/request_context.rb:18:in call’
lib/gitlab/metrics/requests_rack_middleware.rb:27:in `call’