1 files changed, 5 insertions, 5 deletions
diff --git a/app/models/issue.rb b/app/models/issue.rb
index c24a329847c..72183108033 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -98,11 +98,11 @@ class Issue < ActiveRecord::Base
 
   # From all notes on this issue, we'll select the system notes about linked
   # merge requests. Of those, the MRs closing `self` are returned.
-  def closed_by_merge_requests(current_user)
+  def closed_by_merge_requests(current_user = nil)
+    return [] unless open?
+
     notes.system.flat_map do |note|
-      ext = Gitlab::ReferenceExtractor.new(self.project, current_user)
-      ext.analyze(note.note)
-      ext.merge_requests
-    end.uniq.select { |mr| mr.closes_issue?(self) }
+      note.all_references(current_user).merge_requests
+    end.uniq.select { |mr| mr.open? && mr.closes_issue?(self) }
   end
 end