From 9fa7990996ec89f2301f6cc4f3d4ab3860a7b7cd Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Wed, 6 Nov 2019 10:31:56 +0100
Subject: [PATCH] prevent error for empty list

---
 src/components/structures/ScrollPanel.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/components/structures/ScrollPanel.js b/src/components/structures/ScrollPanel.js
index 32efad1e05..1d5c520285 100644
--- a/src/components/structures/ScrollPanel.js
+++ b/src/components/structures/ScrollPanel.js
@@ -759,8 +759,10 @@ module.exports = createReactClass({
     _getMessagesHeight() {
         const itemlist = this.refs.itemlist;
         const lastNode = itemlist.lastElementChild;
+        const lastNodeBottom = lastNode ? lastNode.offsetTop + lastNode.clientHeight : 0;
+        const firstNodeTop = itemlist.firstElementChild ? itemlist.firstElementChild.offsetTop : 0;
         // 18 is itemlist padding
-        return (lastNode.offsetTop + lastNode.clientHeight) - itemlist.firstElementChild.offsetTop + (18 * 2);
+        return lastNodeBottom - firstNodeTop + (18 * 2);
     },
 
     _topFromBottom(node) {