From 475bd17b71cc8a1583e45f211e4ae77282bde930 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Tue, 21 Aug 2018 19:05:29 -0400
Subject: [PATCH] Fix 'title is null' error

Not sure why item.title would ever be null, but this was in a user's
error report and seemed to be causing a restart error.
---
 chrome/content/zotero/xpcom/data/items.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/chrome/content/zotero/xpcom/data/items.js b/chrome/content/zotero/xpcom/data/items.js
index e55a298726..5afa6a9f9f 100644
--- a/chrome/content/zotero/xpcom/data/items.js
+++ b/chrome/content/zotero/xpcom/data/items.js
@@ -1455,7 +1455,7 @@ Zotero.Items = function() {
 	
 	
 	this.getSortTitle = function(title) {
-		if (title === false || title === undefined) {
+		if (title === false || title === undefined || title == null) {
 			return '';
 		}
 		if (typeof title == 'number') {