diff --git a/src/database/mongo/sorted.js b/src/database/mongo/sorted.js
index a056de991f..1d8f992ab9 100644
--- a/src/database/mongo/sorted.js
+++ b/src/database/mongo/sorted.js
@@ -377,8 +377,12 @@ module.exports = function(db, module) {
 	};
 
 	module.isSortedSetMember = function(key, value, callback) {
-		module.sortedSetScore(key, value, function(err, score) {
-			callback(err, !!score);
+		if (!key) {
+			return callback();
+		}
+		value = helpers.valueToString(value);
+		db.collection('objects').findOne({_key: key, value: value}, {_id: 0, value: 1}, function(err, result) {
+			callback(err, !!result);
 		});
 	};
 
diff --git a/src/routes/debug.js b/src/routes/debug.js
index 695e806b23..b81938ccc9 100644
--- a/src/routes/debug.js
+++ b/src/routes/debug.js
@@ -9,7 +9,7 @@ var express = require('express'),
 
 module.exports = function(app, middleware, controllers) {
 	var router = express.Router();
-	app.use(nconf.get('relative_path') + '/debug', router);
+
 	router.get('/uid/:uid', function (req, res) {
 		if (!req.params.uid) {
 			return res.redirect('/404');
@@ -59,4 +59,6 @@ module.exports = function(app, middleware, controllers) {
 	router.get('/test', function(req, res) {
 		res.redirect(404);
 	});
+
+	app.use(nconf.get('relative_path') + '/debug', router);
 };
diff --git a/tests/database/sorted.js b/tests/database/sorted.js
index 6680ee8716..5c34c380b8 100644
--- a/tests/database/sorted.js
+++ b/tests/database/sorted.js
@@ -347,6 +347,10 @@ describe('Sorted Set methods', function() {
 	});
 
 	describe('isSortedSetMember()', function() {
+		before(function(done) {
+			db.sortedSetAdd('zeroscore', 0, 'itemwithzeroscore', done);
+		});
+
 		it('should return false if sorted set does not exist', function(done) {
 			db.isSortedSetMember('doesnotexist', 'value1', function(err, isMember) {
 				assert.equal(err, null);
@@ -373,6 +377,14 @@ describe('Sorted Set methods', function() {
 				done();
 			});
 		});
+
+		it('should return true if element is in sorted set with score 0', function(done) {
+			db.isSortedSetMember('zeroscore', 'itemwithzeroscore', function(err, isMember) {
+				assert.ifError(err);
+				assert.deepEqual(isMember, true);
+				done();
+			});
+		});
 	});
 
 	describe('isSortedSetMembers()', function() {