From 0124a9f38d9c5d8e4890c1e12e65891c62646584 Mon Sep 17 00:00:00 2001
From: Daniel Richards <daniel.richards@automattic.com>
Date: Wed, 8 Jul 2020 17:24:48 +0800
Subject: [PATCH] Fix an issue where dragging while the page has no scrollbar
 results in a console error (#23666)

---
 .../src/components/block-draggable/use-scroll-when-dragging.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/block-editor/src/components/block-draggable/use-scroll-when-dragging.js b/packages/block-editor/src/components/block-draggable/use-scroll-when-dragging.js
index e7f869b2d3b0a..aa66c27503cf9 100644
--- a/packages/block-editor/src/components/block-draggable/use-scroll-when-dragging.js
+++ b/packages/block-editor/src/components/block-draggable/use-scroll-when-dragging.js
@@ -55,6 +55,9 @@ export default function useScrollWhenDragging() {
 	}, [] );
 
 	const scrollOnDragOver = useCallback( ( event ) => {
+		if ( ! scrollParentY.current ) {
+			return;
+		}
 		const scrollParentHeight = scrollParentY.current.offsetHeight;
 		const offsetDragStartPosition =
 			dragStartY.current - scrollParentY.current.offsetTop;