From 5070c04af63f5c5bc594f497992f517dd77b8a92 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Fri, 1 May 2015 04:01:58 -0400
Subject: [PATCH] Ignore invalid fields in Zotero.ItemFields.isValidForType()

---
 chrome/content/zotero/xpcom/data/itemFields.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/chrome/content/zotero/xpcom/data/itemFields.js b/chrome/content/zotero/xpcom/data/itemFields.js
index 650a04602b..c589560982 100644
--- a/chrome/content/zotero/xpcom/data/itemFields.js
+++ b/chrome/content/zotero/xpcom/data/itemFields.js
@@ -159,7 +159,8 @@ Zotero.ItemFields = new function() {
 	
 	
 	function isValidForType(fieldID, itemTypeID) {
-		_fieldCheck(fieldID, 'isValidForType');
+		fieldID = getID(fieldID);
+		if (!fieldID) return false;
 		
 		if (!_fields[fieldID]['itemTypes']) {
 			return false;