diff --git a/src/database/mongo.js b/src/database/mongo.js
index 82ad29223b..45f8814b3b 100644
--- a/src/database/mongo.js
+++ b/src/database/mongo.js
@@ -273,7 +273,7 @@
 	// sets
 
 	module.setAdd = function(key, value, callback) {
-		db.collection('objects').update({_key:key}, {$addToSet: { members: value }}, {upsert:true, w: 1},  function(err, result) {
+		db.collection('objects').update({_key:key}, {$addToSet: { members: value.toString() }}, {upsert:true, w: 1},  function(err, result) {
 			if(callback) {
 				callback(err, result);
 			}
@@ -289,7 +289,7 @@
 	}
 
 	module.isSetMember = function(key, value, callback) {
-		db.collection('objects').findOne({_key:key, members: value}, function(err, item) {
+		db.collection('objects').findOne({_key:key, members: value.toString()}, function(err, item) {
 			callback(err, item !== null && item !== undefined);
 		});
 	}
diff --git a/src/feed.js b/src/feed.js
index fab4fe05a4..798c8bdabd 100644
--- a/src/feed.js
+++ b/src/feed.js
@@ -30,7 +30,12 @@
 	Feed.updateTopic = function (tid, callback) {
 		topics.getTopicWithPosts(tid, 0, 0, -1, function (err, topicData) {
 			if (err) {
-				return callback(new Error('topic-invalid'));
+				if(callback) {
+					return callback(new Error('topic-invalid'));
+				} else {
+					winston.error(err.message);
+					return;
+				}
 			}
 
 			var feed = new rss({