parseInt

src/database/mongo/sorted.js

@@ -112,6 +112,7 @@ module.exports = function(db, module) {
 
 	module.sortedSetCard = function(key, callback) {
 		db.collection('objects').count({_key:key}, function(err, count) {
+			count = parseInt(count, 10);
 			callback(err, count ? count : 0);
 		});
 	};