From c0a97d70efa7c0cc4720be49939ca8c50a702641 Mon Sep 17 00:00:00 2001
From: Robert Speicher <rspeicher@gmail.com>
Date: Thu, 23 Apr 2015 14:01:35 -0400
Subject: [PATCH] Don't allow nil references to get added to results

---
 lib/gitlab/markdown/reference_filter.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/gitlab/markdown/reference_filter.rb b/lib/gitlab/markdown/reference_filter.rb
index efd7ea16fcc..2e8baea68d6 100644
--- a/lib/gitlab/markdown/reference_filter.rb
+++ b/lib/gitlab/markdown/reference_filter.rb
@@ -42,6 +42,8 @@ module Gitlab
       # type  - Singular Symbol reference type (e.g., :issue, :user, etc.)
       # value - Object to add
       def push_result(type, value)
+        return if value.nil?
+
         result[:references][type].push(value)
       end