From 55b872fe3eac4143b52770b4ac532fca21c0934e 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: Sat, 17 Mar 2018 19:17:19 -0400
Subject: [PATCH] add check

---
 src/groups/membership.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/groups/membership.js b/src/groups/membership.js
index da312cd1b7..09e86e12f6 100644
--- a/src/groups/membership.js
+++ b/src/groups/membership.js
@@ -367,9 +367,11 @@ module.exports = function (Groups) {
 	}
 
 	pubsub.on('group:cache:del', function (data) {
-		data.groupNames.forEach(function (groupName) {
-			cache.del(data.uid + ':' + groupName);
-		});
+		if (data && data.groupNames) {
+			data.groupNames.forEach(function (groupName) {
+				cache.del(data.uid + ':' + groupName);
+			});
+		}
 	});
 
 	Groups.isMember = function (uid, groupName, callback) {