From a0d79fe98cc125f59006a162cf572139103393d9 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Wed, 29 Jan 2014 20:36:01 +0100
Subject: [PATCH] Improve type checking in
 ol.events.condition.targetNotEditable

---
 src/ol/events/condition.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/ol/events/condition.js b/src/ol/events/condition.js
index 7171cbde36..dbedefbfdc 100644
--- a/src/ol/events/condition.js
+++ b/src/ol/events/condition.js
@@ -1,6 +1,7 @@
 goog.provide('ol.events.ConditionType');
 goog.provide('ol.events.condition');
 
+goog.require('goog.asserts');
 goog.require('goog.dom.TagName');
 goog.require('goog.functions');
 goog.require('ol.MapBrowserEvent.EventType');
@@ -107,8 +108,9 @@ ol.events.condition.shiftKeyOnly = function(mapBrowserEvent) {
  * @todo stability experimental
  */
 ol.events.condition.targetNotEditable = function(mapBrowserEvent) {
-  var browserEvent = mapBrowserEvent.browserEvent;
-  var tagName = browserEvent.target.tagName;
+  var target = mapBrowserEvent.browserEvent.target;
+  goog.asserts.assertInstanceof(target, Element);
+  var tagName = target.tagName;
   return (
       tagName !== goog.dom.TagName.INPUT &&
       tagName !== goog.dom.TagName.SELECT &&