From 1f7036c6c391ebc84506a2af806c570d7e55db1c Mon Sep 17 00:00:00 2001
From: RubaXa <k.lebedev@corp.mail.ru>
Date: Wed, 27 Sep 2017 15:39:05 +0300
Subject: [PATCH] #1143: + additional parent check

---
 Sortable.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/Sortable.js b/Sortable.js
index 3d6ae34..214bc2b 100644
--- a/Sortable.js
+++ b/Sortable.js
@@ -643,8 +643,10 @@
 
 				// #1143: IFrame support workaround
 				_nextTick(function () {
-					rootEl.insertBefore(cloneEl, dragEl);
-					_dispatchEvent(_this, rootEl, 'clone', dragEl);
+					if (dragEl && (dragEl.parentNode === rootEl)) {
+						rootEl.insertBefore(cloneEl, dragEl);
+						_dispatchEvent(_this, rootEl, 'clone', dragEl);
+					}
 				});
 			}