From 6afce0cf220bb4ed589239e63e3b87c1a74332fc Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Sat, 30 Apr 2016 17:12:56 -0400
Subject: [PATCH] Fix "treeRow is undefined" error dragging to bottom of
 collections list

If you drag past the collections list the row is -1.

Fixes #958
---
 chrome/content/zotero/xpcom/collectionTreeView.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/chrome/content/zotero/xpcom/collectionTreeView.js b/chrome/content/zotero/xpcom/collectionTreeView.js
index 32bb822570..1b4a170092 100644
--- a/chrome/content/zotero/xpcom/collectionTreeView.js
+++ b/chrome/content/zotero/xpcom/collectionTreeView.js
@@ -1432,6 +1432,11 @@ Zotero.CollectionTreeView.prototype.canDropCheck = function (row, orient, dataTr
 	var dataType = dragData.dataType;
 	var data = dragData.data;
 	
+	// Empty space below rows
+	if (row == -1) {
+		return false;
+	}
+	
 	// For dropping collections onto root level
 	if (orient == 1 && row == 0 && dataType == 'zotero/collection') {
 		return true;