From 3f4f5057919fdb4a329e9d2b15378c5c5831ae3b Mon Sep 17 00:00:00 2001
From: alschmiedt <aschmiedt@google.com>
Date: Tue, 25 Jan 2022 14:50:00 -0800
Subject: [PATCH] fix: Adds check for changedTouches (#5869)

---
 core/touch.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/touch.js b/core/touch.js
index b0eb0b347..53f3440d0 100644
--- a/core/touch.js
+++ b/core/touch.js
@@ -217,7 +217,7 @@ exports.checkTouchIdentifier = checkTouchIdentifier;
  * @alias Blockly.Touch.setClientFromTouch
  */
 const setClientFromTouch = function(e) {
-  if (utilsString.startsWith(e.type, 'touch')) {
+  if (utilsString.startsWith(e.type, 'touch') && e.changedTouches) {
     // Map the touch event's properties to the event.
     const touchPoint = e.changedTouches[0];
     e.clientX = touchPoint.clientX;