From ea8627a4538a96dd6b0feadcfd8fe0157aa5c206 Mon Sep 17 00:00:00 2001
From: Andrew Duthie <andrew@andrewduthie.com>
Date: Fri, 27 Mar 2020 10:34:45 -0400
Subject: [PATCH] Components: SlotFill: Guard property access to
 possibly-undefined slot

---
 .../src/slot-fill/bubbles-virtually/slot-fill-provider.js       | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/components/src/slot-fill/bubbles-virtually/slot-fill-provider.js b/packages/components/src/slot-fill/bubbles-virtually/slot-fill-provider.js
index d487d98fbfa9a1..26b4a32c7c600c 100644
--- a/packages/components/src/slot-fill/bubbles-virtually/slot-fill-provider.js
+++ b/packages/components/src/slot-fill/bubbles-virtually/slot-fill-provider.js
@@ -29,7 +29,7 @@ function useSlotRegistry() {
 			const { [ name ]: slot, ...nextSlots } = prevSlots;
 			// Make sure we're not unregistering a slot registered by another element
 			// See https://github.com/WordPress/gutenberg/pull/19242#issuecomment-590295412
-			if ( slot.ref === ref ) {
+			if ( slot?.ref === ref ) {
 				return nextSlots;
 			}
 			return prevSlots;