diff --git a/lib/gitlab/url_blocker.rb b/lib/gitlab/url_blocker.rb
index bb2f4edc1a0dc30b91712f1a55bfdb2c67ef7e7e..7e14a5666960c34f85602c7118cc17250e0d8fa4 100644
--- a/lib/gitlab/url_blocker.rb
+++ b/lib/gitlab/url_blocker.rb
@@ -8,6 +8,8 @@ module Gitlab
       VALID_PORTS = [22, 80, 443].freeze
 
       def blocked_url?(url)
+        return false if url.nil?
+
         blocked_ips = ["127.0.0.1", "::1", "0.0.0.0"]
         blocked_ips.concat(Socket.ip_address_list.map(&:ip_address))