From c72c876b0499389e2926fec5e3359209b62913d8 Mon Sep 17 00:00:00 2001
From: barisusakli <barisusakli@gmail.com>
Date: Thu, 2 Oct 2014 18:57:15 -0400
Subject: [PATCH] check value

---
 src/database/mongo/sorted.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/database/mongo/sorted.js b/src/database/mongo/sorted.js
index 3714f5549d..ab4943c48c 100644
--- a/src/database/mongo/sorted.js
+++ b/src/database/mongo/sorted.js
@@ -287,6 +287,9 @@ module.exports = function(db, module) {
 			}
 
 			var result = values.map(function(value) {
+				if (!value) {
+					return null;
+				}
 				var index = sortedSet.indexOf(value.toString());
 				return index !== -1 ? index : null;
 			});