From f9449b1749110f5d7d78938c3cca7d187dc479d4 Mon Sep 17 00:00:00 2001
From: Adomas Ven <adomas.ven@gmail.com>
Date: Mon, 13 Jun 2016 11:56:39 +0300
Subject: [PATCH] Fixes hidden columns showing on restart. Closes #1030 (#1031)

---
 chrome/content/zotero/zoteroPane.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 448a2a682..561d61c0b 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -4679,8 +4679,9 @@ var ZoteroPane = new function()
 			if(!id) continue;
 			var elValues = {};
 			for (let attr of el.getAttribute("zotero-persist").split(/[\s,]+/)) {
-				var attrValue = el.getAttribute(attr);
-				elValues[attr] = attrValue;
+				if (el.hasAttribute(attr)) {
+					elValues[attr] = el.getAttribute(attr);
+				}
 			}
 			serializedValues[id] = elValues;
 		}