From ca53fbd49f62d73cea8c961cbf1d7e398e8c0786 Mon Sep 17 00:00:00 2001
From: Sean Harvey <sean@silverstripe.com>
Date: Tue, 12 Oct 2010 01:29:56 +0000
Subject: [PATCH] BUGFIX #6089 Avoid javascript error when "Allow drag & drop
 reordering" enabled, and attempt to drag a file from one folder to another is
 performed

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@111932 467b73ca-7a2a-4603-9d3b-597d59a354a9
---
 javascript/tree/tree.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/javascript/tree/tree.js b/javascript/tree/tree.js
index 2e13fd68a..dfae3b823 100644
--- a/javascript/tree/tree.js
+++ b/javascript/tree/tree.js
@@ -147,6 +147,8 @@ Tree.prototype = {
 	 * If 'before' is specified, then it will be inserted before that.
 	 */
 	appendTreeNode : function(child, before) {
+		if(!child) return;
+
 		// Remove from the old parent node - this will ensure that the classes of the old tree
 		// item are updated accordingly
 		if(child.parentTreeNode) {