Issue update failed - Milestone sorting issue
This happens when you are Milestones view page, and move issue from one state to another.
Started PUT "/group-name/project-name/milestones/1/sort_issues" for 122.174.117.54 at 2016-04-25 11:26:25 +0000
Processing by Projects::MilestonesController#sort_issues as JSON Parameters: {"namespace_id"=>"group-name", "project_id"=>"project-name", "id"=>"1"}
Started PUT "/group-name/project-name/issues/2" for 122.174.117.54 at 2016-04-25 11:26:25 +0000
Processing by Projects::IssuesController#update as JSON Parameters: {"issue"=>{"assignee_id"=>"1", "state_event"=>"reopen"}, "namespace_id"=>"group-name", "project_id"=>"project-name", "id"=>"2"}
Completed 500 Internal Server Error in 95ms (ActiveRecord: 3.0ms)
NoMethodError (undefined method map' for nil:NilClass): app/controllers/projects/milestones_controller.rb:83:in
sort_issues'
lib/gitlab/middleware/go.rb:16:in `call'