diff --git a/src/database/mongo/sorted.js b/src/database/mongo/sorted.js
index 3edaea5392..2bf159f25d 100644
--- a/src/database/mongo/sorted.js
+++ b/src/database/mongo/sorted.js
@@ -180,6 +180,10 @@ module.exports = function(db, module) {
 					return item.value;
 				});
 
+				data = data.filter(function(value, index, array) {
+					return array.indexOf(value) === index;
+				});
+
 				callback(null, data);
 			});
 	}