Error 500 when trying to view Open Merge Request

[dwayne...@gmail.com]

Hi,

I have just upgrade to version 8.9.1 and am now getting an Internal Server Error every time I try and view an Open Merge Request.

Can anyone suggest a fix for this?

## Error Message from production.log ##

Started GET "/group/project/merge_requests/253" for 58.96.111.210 at 2016-06-27 13:29:51 +0930

Processing by Projects::MergeRequestsController#show as HTML

Parameters: {"namespace_id"=>"group", "project_id"=>"project", "id"=>"253"}

Completed 500 Internal Server Error in 229ms (ActiveRecord: 17.1ms)

ActionView::Template::Error (undefined method `to_reference' for nil:NilClass):

28: %i.fa.fa-check

29: Accepting this merge request will close #{"issue".pluralize(@closes_issues.size)}

30: = succeed '.' do

31: != markdown issues_sentence(@closes_issues), pipeline: :gfm, author: @merge_request.author

app/helpers/merge_requests_helper.rb:54:in `block in issues_sentence'

app/helpers/merge_requests_helper.rb:53:in `map'

app/helpers/merge_requests_helper.rb:53:in `issues_sentence'

app/views/projects/merge_requests/widget/_open.html.haml:31:in `block in _app_views_projects_merge_requests_widget__open_html_haml___3482385759067444044_63933620'

app/views/projects/merge_requests/widget/_open.html.haml:30:in `_app_views_projects_merge_requests_widget__open_html_haml___3482385759067444044_63933620'

app/views/projects/merge_requests/widget/_show.html.haml:2:in `_app_views_projects_merge_requests_widget__show_html_haml__3463590168662962941_64168040'

app/views/projects/merge_requests/_show.html.haml:37:in `_app_views_projects_merge_requests__show_html_haml__3466253160041587634_58692340'

app/views/projects/merge_requests/show.html.haml:1:in `_app_views_projects_merge_requests_show_html_haml___2399256729082784133_59032460'

app/controllers/projects/merge_requests_controller.rb:59:in `show'

lib/gitlab/middleware/go.rb:16:in `call'

Cheers

Dwayne

[Crusty Punk]

I'm also getting this error on 8.9.3:

==> /var/log/gitlab/gitlab-rails/production.log <==

Started GET "/leap/bitmask_client/merge_requests/3" for 199.58.81.144 at 2016-07-01 16:44:43 +0000

Processing by Projects::MergeRequestsController#show as HTML

  Parameters: {"namespace_id"=>"leap", "project_id"=>"bitmask_client", "id"=>"3"}

Completed 500 Internal Server Error in 174ms (ActiveRecord: 10.8ms)

ActionView::Template::Error (undefined method `to_reference' for nil:NilClass):

    28:         %i.fa.fa-check

    29:         Accepting this merge request will close #{"issue".pluralize(@closes_issues.size)}

    30:         = succeed '.' do

    31:           != markdown issues_sentence(@closes_issues), pipeline: :gfm, author: @merge_request.author

  app/helpers/merge_requests_helper.rb:54:in `block in issues_sentence'

  app/helpers/merge_requests_helper.rb:53:in `map'

  app/helpers/merge_requests_helper.rb:53:in `issues_sentence'

  app/views/projects/merge_requests/widget/_open.html.haml:31:in `block in _app_views_projects_merge_requests_widget__open_html_haml__674683464302954744_84900880'

  app/views/projects/merge_requests/widget/_open.html.haml:30:in `_app_views_projects_merge_requests_widget__open_html_haml__674683464302954744_84900880'

  app/views/projects/merge_requests/widget/_show.html.haml:2:in `_app_views_projects_merge_requests_widget__show_html_haml__3459973152755927178_176080340'

  app/views/projects/merge_requests/_show.html.haml:37:in `_app_views_projects_merge_requests__show_html_haml___2864171938813218051_178058660'

  app/views/projects/merge_requests/show.html.haml:1:in `_app_views_projects_merge_requests_show_html_haml___772773678533907563_178113520'

  app/controllers/projects/merge_requests_controller.rb:59:in `show'

  lib/gitlab/middleware/go.rb:16:in `call'

[Crusty Punk]

If I turn off redmine integration, then things work again.