From f3ced4fe5692a7d1a3bea477c7cab7de0fb5ba1e Mon Sep 17 00:00:00 2001
From: piro <piro@599a83e7-65a4-db11-8015-0010dcdd6dc2>
Date: Fri, 5 Feb 2010 02:12:01 +0000
Subject: [PATCH] =?UTF-8?q?=E3=82=BF=E3=83=96=E3=83=90=E3=83=BC=E3=81=AE?=
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git-svn-id: http://www.cozmixng.org/repos/piro/treestyletab/trunk@6262 599a83e7-65a4-db11-8015-0010dcdd6dc2
---
 content/treestyletab/treestyletabbrowser_tabpanelDNDObserver.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/content/treestyletab/treestyletabbrowser_tabpanelDNDObserver.js b/content/treestyletab/treestyletabbrowser_tabpanelDNDObserver.js
index f979c203..b19dc2d5 100644
--- a/content/treestyletab/treestyletabbrowser_tabpanelDNDObserver.js
+++ b/content/treestyletab/treestyletabbrowser_tabpanelDNDObserver.js
@@ -30,7 +30,7 @@ TreeStyleTabBrowserTabpanelDNDObserver.prototype = {
 		if (position != 'center' &&
 			position != sv.mTabBrowser.getAttribute(sv.kTABBAR_POSITION)) {
 			if (sv.getTreePref('tabbar.fixed.autoCancelOnDrop') &&
-				aXferData.data != sv.kTABBAR_MOVE_FORCE) {
+				(!aXferData || aXferData.data != sv.kTABBAR_MOVE_FORCE)) {
 				let orient = (position == 'left' || position == 'right') ? 'vertical' : 'horizontal' ;
 				sv.setTreePref('tabbar.fixed.'+orient, false);
 			}