From 83d11947ffd27fb8712d6ddd61a1f2dd82ac2952 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Mon, 11 Jul 2016 06:25:19 -0400
Subject: [PATCH] Fix UI breakage that prevents switching collections

I'll add a test later once I figure out how to reproduce this, but I
think this should fix the "id is undefined" errors.
---
 chrome/content/zotero/xpcom/libraryTreeView.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chrome/content/zotero/xpcom/libraryTreeView.js b/chrome/content/zotero/xpcom/libraryTreeView.js
index 9dd5cd89d..b35309ff7 100644
--- a/chrome/content/zotero/xpcom/libraryTreeView.js
+++ b/chrome/content/zotero/xpcom/libraryTreeView.js
@@ -130,7 +130,7 @@ Zotero.LibraryTreeView.prototype = {
 	 * Restore a scroll position returned from _saveScrollPosition()
 	 */
 	_rememberScrollPosition: function (scrollPosition) {
-		if (!scrollPosition) {
+		if (!scrollPosition || !scrollPosition.id) {
 			return;
 		}
 		var row = this.getRowIndexByID(scrollPosition.id);