diff --git a/src/topics.js b/src/topics.js
index 310cbe2448..f58d8632dd 100644
--- a/src/topics.js
+++ b/src/topics.js
@@ -149,7 +149,7 @@ var	RDB = require('./redis.js'),
 
 			// Posts
 			posts.create(uid, tid, content, function(pid) {
-				RDB.lpush('tid:' + tid + ':posts', pid);
+				if (pid > 0) RDB.lpush('tid:' + tid + ':posts', pid);
 			});