From 58242905d62418c5cc4749dcac957378459eeb24 Mon Sep 17 00:00:00 2001
From: Joram Wilander <jwawilander@gmail.com>
Date: Tue, 30 Aug 2016 18:55:29 -0400
Subject: Fix scrollHeight console error when logging out of iOS app (#3909)

---
 webapp/components/post_view/components/post_list.jsx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'webapp')

diff --git a/webapp/components/post_view/components/post_list.jsx b/webapp/components/post_view/components/post_list.jsx
index f891afdb3..b008245f6 100644
--- a/webapp/components/post_view/components/post_list.jsx
+++ b/webapp/components/post_view/components/post_list.jsx
@@ -49,6 +49,7 @@ export default class PostList extends React.Component {
         this.jumpToPostNode = null;
         this.wasAtBottom = true;
         this.scrollHeight = 0;
+        this.animationFrameId = 0;
 
         this.scrollStopAction = new DelayedAction(this.handleScrollStop);
 
@@ -431,7 +432,7 @@ export default class PostList extends React.Component {
     }
 
     scrollToBottom() {
-        window.requestAnimationFrame(() => {
+        this.animationFrameId = window.requestAnimationFrame(() => {
             this.refs.postlist.scrollTop = this.refs.postlist.scrollHeight;
         });
     }
@@ -464,13 +465,14 @@ export default class PostList extends React.Component {
     }
 
     componentWillUnmount() {
+        window.cancelAnimationFrame(this.animationFrameId);
         window.removeEventListener('resize', this.handleResize);
         window.removeEventListener('keydown', this.handleKeyDown);
         this.scrollStopAction.cancel();
     }
 
     componentDidUpdate() {
-        if (this.props.postList != null) {
+        if (this.props.postList != null && this.refs.postlist) {
             this.updateScrolling();
         }
     }
-- 
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