From fcf2a8a5c90e6a975b0a8c391aa2f95f6e860b15 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Xavier=20Villel=C3=A9gier?= <x.villelegier@gmail.com>
Date: Wed, 29 Dec 2021 12:51:04 +0100
Subject: [PATCH] prevent error in handleBodyTouchEnd

---
 packages/mui-material/src/SwipeableDrawer/SwipeableDrawer.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/mui-material/src/SwipeableDrawer/SwipeableDrawer.js b/packages/mui-material/src/SwipeableDrawer/SwipeableDrawer.js
index eab5cdf5642c46..4510fea414a307 100644
--- a/packages/mui-material/src/SwipeableDrawer/SwipeableDrawer.js
+++ b/packages/mui-material/src/SwipeableDrawer/SwipeableDrawer.js
@@ -227,7 +227,8 @@ const SwipeableDrawer = React.forwardRef(function SwipeableDrawer(inProps, ref)
   );
 
   const handleBodyTouchEnd = useEventCallback((nativeEvent) => {
-    if (!touchDetected.current) {
+    // the ref may be null when a parent component updates while swiping
+    if (!paperRef.current || !touchDetected.current) {
       return;
     }
     claimedSwipeInstance = null;