From 4b46f252fd46b1f0f1c99abfa9a644e03e2295cc Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Mon, 4 Mar 2013 18:25:44 -0500
Subject: [PATCH] Fix error on column header click

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

diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 2bcfa0e43..c7f34a3a9 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -2374,6 +2374,11 @@ var ZoteroPane = new function()
 		var t = event.originalTarget;
 		var tree = t.parentNode;
 		
+		// Ignore click on column headers
+		if (!tree.treeBoxObject) {
+			return;
+		}
+		
 		var row = {}, col = {}, obj = {};
 		tree.treeBoxObject.getCellAt(event.clientX, event.clientY, row, col, obj);
 		if (row.value == -1) {