From 7135d25a4aeb40ad1b5313c516ec766c1f8d1b63 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bar=C4=B1=C5=9F=20Soner=20U=C5=9Fakl=C4=B1?=
 <baris@nodebb.org>
Date: Mon, 8 May 2017 12:19:22 -0400
Subject: [PATCH] closes #5654

---
 src/database/redis/sorted/add.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/database/redis/sorted/add.js b/src/database/redis/sorted/add.js
index 5a21639be4..b279f5ba76 100644
--- a/src/database/redis/sorted/add.js
+++ b/src/database/redis/sorted/add.js
@@ -3,6 +3,9 @@
 module.exports = function (redisClient, module) {
 	module.sortedSetAdd = function (key, score, value, callback) {
 		callback = callback || function () {};
+		if (!key) {
+			return setImmediate(callback);
+		}
 		if (Array.isArray(score) && Array.isArray(value)) {
 			return sortedSetAddMulti(key, score, value, callback);
 		}
@@ -39,7 +42,9 @@ module.exports = function (redisClient, module) {
 		var multi = redisClient.multi();
 
 		for (var i = 0; i < keys.length; i += 1) {
-			multi.zadd(keys[i], score, value);
+			if (keys[i]) {
+				multi.zadd(keys[i], score, value);
+			}
 		}
 
 		multi.exec(function (err) {