From 6514504dddcc22147287d04ca115519e2077f832 Mon Sep 17 00:00:00 2001
From: Julian Lam <julian@designcreateplay.com>
Date: Mon, 27 Jan 2014 09:09:55 -0500
Subject: [PATCH] fixed #889

---
 src/categories.js | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/src/categories.js b/src/categories.js
index 31e425c27b..85849b6523 100644
--- a/src/categories.js
+++ b/src/categories.js
@@ -136,16 +136,23 @@ var db = require('./database'),
 				topics.getTopicsByTids(tids, cid, uid, next);
 			},
 			function(topics, next) {
-				db.sortedSetRevRank('categories:' + cid + ':tid', topics[topics.length - 1].tid, function(err, rank) {
-					if(err) {
-						return next(err);
-					}
+				if (topics && topics.length > 0) {
+					db.sortedSetRevRank('categories:' + cid + ':tid', topics[topics.length - 1].tid, function(err, rank) {
+						if(err) {
+							return next(err);
+						}
 
-					return next(null, {
+						next(null, {
+							topics: topics,
+							nextStart: parseInt(rank, 10) + 1
+						});
+					});
+				} else {
+					next(null, {
 						topics: topics,
-						nextStart: parseInt(rank, 10) + 1
+						nextStart: 1
 					});
-				});
+				}
 			}
 		], callback);
 	};