From c6e2cf4cc71255c41fe4f389aa5173d77a4f8df4 Mon Sep 17 00:00:00 2001
From: piro <piro@599a83e7-65a4-db11-8015-0010dcdd6dc2>
Date: Fri, 31 Jul 2009 01:59:25 +0000
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git-svn-id: http://www.cozmixng.org/repos/piro/treestyletab/trunk@4847 599a83e7-65a4-db11-8015-0010dcdd6dc2
---
 content/treestyletab/bookmarksOverlay.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/content/treestyletab/bookmarksOverlay.js b/content/treestyletab/bookmarksOverlay.js
index 46d2370c..865686d1 100644
--- a/content/treestyletab/bookmarksOverlay.js
+++ b/content/treestyletab/bookmarksOverlay.js
@@ -16,7 +16,8 @@ window.addEventListener('load', function() {
 			<![CDATA[
 				var openGroupBookmarkBehavior = TreeStyleTabService.openGroupBookmarkBehavior();
 				var treeStructure = ids.map(function(aId) {
-						return ids.indexOf(TreeStyleTabService.getParentItemForBookmark(aId));
+						let id = TreeStyleTabService.getParentItemForBookmark(aId);
+						return id < 0 ? -1 : ids.indexOf(id);
 					});
 				treeStructure = treeStructure.reverse();
 				treeStructure = treeStructure.map(function(aPosition, aIndex) {