diff --git a/src/topics/teaser.js b/src/topics/teaser.js
index 508bd51bc8..fddc32052d 100644
--- a/src/topics/teaser.js
+++ b/src/topics/teaser.js
@@ -57,7 +57,12 @@ module.exports = function (Topics) {
 			function (next) {
 				posts.getPostsFields(teaserPids, ['pid', 'uid', 'timestamp', 'tid', 'content'], next);
 			},
-			async.apply(user.blocks.filter, uid),
+			function (_postData, next) {
+				_postData = _postData.filter(function (post) {
+					return post && parseInt(post.pid, 10);
+				})
+				user.blocks.filter(uid, _postData, next);
+			},
 			function (_postData, next) {
 				postData = _postData;
 				var uids = _.uniq(postData.map(function (post) {