From b49f83f3ae2cf7205531d85badad666706100438 Mon Sep 17 00:00:00 2001
From: Germain <germain@souquet.com>
Date: Wed, 18 Jan 2023 16:43:18 +0000
Subject: [PATCH 1/3] replace .at() with array.length-1

---
 src/Unread.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Unread.ts b/src/Unread.ts
index cbd30b2bb8..6e7218cad1 100644
--- a/src/Unread.ts
+++ b/src/Unread.ts
@@ -85,7 +85,7 @@ export function doesRoomOrThreadHaveUnreadMessages(roomOrThread: Room | Thread):
     //             https://github.com/vector-im/element-web/issues/2427
     // ...and possibly some of the others at
     //             https://github.com/vector-im/element-web/issues/3363
-    if (roomOrThread.timeline.at(-1)?.getSender() === myUserId) {
+    if (roomOrThread.timeline[roomOrThread.timeline.length - 1]?.getSender() === myUserId) {
         return false;
     }
 

From 8d4705647bfe5bf9a7afe79301707f3e98272dfb Mon Sep 17 00:00:00 2001
From: RiotRobot <releases@riot.im>
Date: Wed, 18 Jan 2023 21:57:00 +0000
Subject: [PATCH 2/3] Prepare changelog for v3.64.1

---
 CHANGELOG.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8e23bda8a..c6a0f92e41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+Changes in [3.64.1](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.64.1) (2023-01-18)
+=====================================================================================================
+
+## 🐛 Bug Fixes
+ * Fix crash in older browsers (replace .at() with array.length-1) ([\#9933](https://github.com/matrix-org/matrix-react-sdk/pull/9933)). Fixes matrix-org/element-web-rageshakes#19281.
+
 Changes in [3.64.0](https://github.com/matrix-org/matrix-react-sdk/releases/tag/v3.64.0) (2023-01-18)
 =====================================================================================================
 

From 8219e4459681d26b9241bf396b37cbfc40e93a70 Mon Sep 17 00:00:00 2001
From: RiotRobot <releases@riot.im>
Date: Wed, 18 Jan 2023 21:57:02 +0000
Subject: [PATCH 3/3] v3.64.1

---
 package.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package.json b/package.json
index 1591fed735..f9e9a87255 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "matrix-react-sdk",
-    "version": "3.64.0",
+    "version": "3.64.1",
     "description": "SDK for matrix.org using React",
     "author": "matrix.org",
     "repository": {