From b16932a67635af8bcb9f3b7b7a0caadb18e4b6da Mon Sep 17 00:00:00 2001
From: barisusakli <barisusakli@gmail.com>
Date: Tue, 12 Aug 2014 15:08:42 -0400
Subject: [PATCH] check mainPid

---
 src/topics.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/topics.js b/src/topics.js
index 926f8bb78b..34fe471163 100644
--- a/src/topics.js
+++ b/src/topics.js
@@ -262,7 +262,10 @@ var async = require('async'),
 							return next(err);
 						}
 
-						pids = [topicData.mainPid].concat(pids);
+						pids = topicData.mainPid ? [topicData.mainPid].concat(pids) : pids;
+						if (!pids.length) {
+							return next(null, []);
+						}
 						posts.getPostsByPids(pids, tid, function(err, posts) {
 							if (err) {
 								return next(err);