From 44a9c181aa4a756989198cb01c7f81a11134acc6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Tue, 9 Jul 2013 10:06:01 +0200
Subject: [PATCH] handleMapPostrender may get a null frameState

---
 src/ol/control/zoomslidercontrol.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/ol/control/zoomslidercontrol.js b/src/ol/control/zoomslidercontrol.js
index a9248c41c0..f8d5c55bbf 100644
--- a/src/ol/control/zoomslidercontrol.js
+++ b/src/ol/control/zoomslidercontrol.js
@@ -159,6 +159,11 @@ ol.control.ZoomSlider.prototype.initSlider_ = function() {
  * @inheritDoc
  */
 ol.control.ZoomSlider.prototype.handleMapPostrender = function(mapEvent) {
+  if (goog.isNull(mapEvent.frameState)) {
+    return;
+  }
+  goog.asserts.assert(
+      goog.isDefAndNotNull(mapEvent.frameState.view2DState));
   if (!this.sliderInitialized_) {
     this.initSlider_();
   }