diff --git a/src/database/mongo/hash.js b/src/database/mongo/hash.js
index fe80afaaf4..dbf294119e 100644
--- a/src/database/mongo/hash.js
+++ b/src/database/mongo/hash.js
@@ -1,7 +1,5 @@
 "use strict";
 
-var winston = require('winston');
-
 module.exports = function(db, module) {
 	var helpers = module.helpers.mongo;
 
@@ -121,9 +119,8 @@ module.exports = function(db, module) {
 			}
 
 			var map = helpers.toMap(items);
-			var returnData = [],
-				index = 0,
-				item;
+			var returnData = [];
+			var item;
 
 			for (var i=0; i<keys.length; ++i) {
 				item = map[keys[i]] || {};
@@ -219,7 +216,7 @@ module.exports = function(db, module) {
 			data[field] = '';
 		});
 
-		db.collection('objects').update({_key: key}, {$unset : data}, function(err, res) {
+		db.collection('objects').update({_key: key}, {$unset : data}, function(err) {
 			callback(err);
 		});
 	};
diff --git a/src/search.js b/src/search.js
index ca457d8b0b..9b7306c7fa 100644
--- a/src/search.js
+++ b/src/search.js
@@ -85,7 +85,9 @@ function searchInContent(data, callback) {
 					topics.getMainPids(results.tids, next);
 				},
 				function(mainPids, next) {
-					results.pids = mainPids.concat(results.pids).filter(function(pid, index, array) {
+					results.pids = mainPids.concat(results.pids).map(function(pid) {
+						return pid && pid.toString();
+					}).filter(function(pid, index, array) {
 						return pid && array.indexOf(pid) === index;
 					});