From 2f3ac14a434c773577771b74292aa313d57db3c9 Mon Sep 17 00:00:00 2001
From: unarist <m.unarist@gmail.com>
Date: Tue, 27 Mar 2018 20:05:59 +0900
Subject: [PATCH] Add missing null handling in notification reducer (#6930)

This patch adds null item (i.e. gap) handling on below functions to avoid TypeError.

* `filterNotifications` called on user mute/block
* `deleteByStatus` called on status deletion
---
 app/javascript/mastodon/reducers/notifications.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/app/javascript/mastodon/reducers/notifications.js b/app/javascript/mastodon/reducers/notifications.js
index f023984b8..1ac7eb706 100644
--- a/app/javascript/mastodon/reducers/notifications.js
+++ b/app/javascript/mastodon/reducers/notifications.js
@@ -82,7 +82,7 @@ const expandNormalizedNotifications = (state, notifications, next) => {
 };
 
 const filterNotifications = (state, relationship) => {
-  return state.update('items', list => list.filterNot(item => item.get('account') === relationship.id));
+  return state.update('items', list => list.filterNot(item => item !== null && item.get('account') === relationship.id));
 };
 
 const updateTop = (state, top) => {
@@ -94,7 +94,7 @@ const updateTop = (state, top) => {
 };
 
 const deleteByStatus = (state, statusId) => {
-  return state.update('items', list => list.filterNot(item => item.get('status') === statusId));
+  return state.update('items', list => list.filterNot(item => item !== null && item.get('status') === statusId));
 };
 
 export default function notifications(state = initialState, action) {