From fc272199c780ce1c8eff458dbf2010e9ca349acd Mon Sep 17 00:00:00 2001
From: Ansis Brammanis <ansis.brammanis@gmail.com>
Date: Wed, 16 Jan 2013 11:34:50 -0500
Subject: [PATCH] Fix difference

---
 js/id/graph/graph.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/id/graph/graph.js b/js/id/graph/graph.js
index 5e5792346..9b6de7219 100644
--- a/js/id/graph/graph.js
+++ b/js/id/graph/graph.js
@@ -134,7 +134,7 @@ iD.Graph.prototype = {
             entity = this.entities[id];
             oldentity = graph.entities[id];
             if (entity !== oldentity) {
-                if (entity.type === 'way') {
+                if (entity && entity.type === 'way') {
                     result = oldentity
                         ? result
                             .concat(_.difference(entity.nodes, oldentity.nodes))