From 62cdf40a39239b2ef4f9cd751fecf4d57a6cacd0 Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Thu, 7 Feb 2019 12:11:16 +0000
Subject: [PATCH] dont assume a user has joined all the rooms in a community

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

diff --git a/src/stores/TagOrderStore.js b/src/stores/TagOrderStore.js
index 8ecc47d430..92c48fe206 100644
--- a/src/stores/TagOrderStore.js
+++ b/src/stores/TagOrderStore.js
@@ -180,7 +180,10 @@ class TagOrderStore extends Store {
             const client = MatrixClientPeg.get();
             const changedBadges = {};
             groupIds.forEach(groupId => {
-                const rooms = GroupStore.getGroupRooms(groupId).map(r => client.getRoom(r.roomId));
+                const rooms =
+                    GroupStore.getGroupRooms(groupId)
+                    .map(r => client.getRoom(r.roomId)) // to Room objects
+                    .filter(r => !!r);   // filter out rooms we haven't joined from the group
                 const badge = rooms && RoomNotifs.aggregateNotificationCount(rooms);
                 changedBadges[groupId] = (badge && badge.count !== 0) ? badge : undefined;
             });