From 6163f05b2b01f407e76dade9f3cdac6fe53d5f51 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Mon, 8 Apr 2013 12:50:12 +0200
Subject: [PATCH] ZoomSlider setMap deals with undefined resolution

---
 src/ol/control/zoomslidercontrol.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/ol/control/zoomslidercontrol.js b/src/ol/control/zoomslidercontrol.js
index 111e3a617e..3ac392fe20 100644
--- a/src/ol/control/zoomslidercontrol.js
+++ b/src/ol/control/zoomslidercontrol.js
@@ -152,9 +152,12 @@ ol.control.ZoomSlider.DEFAULT_MAX_RESOLUTION = 156543.0339;
  */
 ol.control.ZoomSlider.prototype.setMap = function(map) {
   goog.base(this, 'setMap', map);
-  this.currentResolution_ = map.getView().getResolution();
   this.initSlider_();
-  this.positionThumbForResolution_(this.currentResolution_);
+  var resolution = map.getView().getResolution();
+  if (goog.isDef(resolution)) {
+    this.currentResolution_ = resolution;
+    this.positionThumbForResolution_(resolution);
+  }
 };