From 18a5535205f825622beb8d71433d10f96780fb9b Mon Sep 17 00:00:00 2001
From: Chris Duarte <csduarte@users.noreply.github.com>
Date: Tue, 28 Nov 2017 11:51:06 -0800
Subject: [PATCH] Defensive fix for post list scrollToIndex (#1223)

---
 app/components/post_list/post_list.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/components/post_list/post_list.js b/app/components/post_list/post_list.js
index a84bf0bb9..6b103b10a 100644
--- a/app/components/post_list/post_list.js
+++ b/app/components/post_list/post_list.js
@@ -81,7 +81,7 @@ export default class PostList extends PureComponent {
 
     scrollList = () => {
         InteractionManager.runAfterInteractions(() => {
-            if (this.props.postIds.length && this.newMessagesIndex !== -1) {
+            if (this.props.postIds.length && this.newMessagesIndex !== -1 && this.newMessagesIndex <= this.props.postIds.length) {
                 if (this.refs.list) {
                     this.refs.list.scrollToIndex({
                         index: this.newMessagesIndex,