From 0f401a2d5168f4cf492cce52ea2eb3c8a1efc1be Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Tue, 14 Aug 2012 10:24:12 +0200
Subject: [PATCH] forEach cannot iterate over a null object

---
 src/ol/base/maprenderer.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ol/base/maprenderer.js b/src/ol/base/maprenderer.js
index a69d8ac48b..cbb0cca078 100644
--- a/src/ol/base/maprenderer.js
+++ b/src/ol/base/maprenderer.js
@@ -110,7 +110,9 @@ ol.MapRenderer.prototype.disposeInternal = function() {
     goog.dispose(layerRenderer);
   });
   goog.array.forEach(this.mapListenerKeys_, goog.events.unlistenByKey);
-  goog.array.forEach(this.layersListenerKeys_, goog.events.unlistenByKey);
+  if (!goog.isNull(this.layersListenerKeys_)) {
+    goog.array.forEach(this.layersListenerKeys_, goog.events.unlistenByKey);
+  }
   goog.base(this, 'disposeInternal');
 };