From 3ba6a273c1fec6b8c7052b5dbdb34554425e63a3 Mon Sep 17 00:00:00 2001
From: Marek Lewandowski <m.lewandowski@cksource.com>
Date: Mon, 20 Jul 2020 17:18:06 +0200
Subject: [PATCH] Fixed (ui): Fixed a case when removing the first hidden
 toolbar button would throw an exception. Closes #7655.

---
 packages/ckeditor5-ui/src/toolbar/toolbarview.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/ckeditor5-ui/src/toolbar/toolbarview.js b/packages/ckeditor5-ui/src/toolbar/toolbarview.js
index 340446697eb..c6f30528cd6 100644
--- a/packages/ckeditor5-ui/src/toolbar/toolbarview.js
+++ b/packages/ckeditor5-ui/src/toolbar/toolbarview.js
@@ -557,7 +557,7 @@ class DynamicGrouping {
 
 			// Removing.
 			for ( const removedItem of changeData.removed ) {
-				if ( index > this.ungroupedItems.length ) {
+				if ( index >= this.ungroupedItems.length ) {
 					this.groupedItems.remove( removedItem );
 				} else {
 					this.ungroupedItems.remove( removedItem );