diff --git a/lib/OpenLayers/Control/Pan.js b/lib/OpenLayers/Control/Pan.js
index 2850aa83bb..2c85caa10f 100644
--- a/lib/OpenLayers/Control/Pan.js
+++ b/lib/OpenLayers/Control/Pan.js
@@ -70,26 +70,27 @@ OpenLayers.Control.Pan = OpenLayers.Class(OpenLayers.Control, {
      * Method: trigger
      */
     trigger: function(){
+        if (this.map) {
+            var getSlideFactor = OpenLayers.Function.bind(function (dim) {
+                return this.slideRatio ?
+                    this.map.getSize()[dim] * this.slideRatio :
+                    this.slideFactor;
+            }, this);
     
-        var getSlideFactor = OpenLayers.Function.bind(function (dim) {
-            return this.slideRatio ?
-                this.map.getSize()[dim] * this.slideRatio :
-                this.slideFactor;
-        }, this);
-
-        switch (this.direction) {
-            case OpenLayers.Control.Pan.NORTH: 
-                this.map.pan(0, -getSlideFactor("h"));
-                break;
-            case OpenLayers.Control.Pan.SOUTH: 
-                this.map.pan(0, getSlideFactor("h"));
-                break;
-            case OpenLayers.Control.Pan.WEST: 
-                this.map.pan(-getSlideFactor("w"), 0);
-                break;
-            case OpenLayers.Control.Pan.EAST: 
-                this.map.pan(getSlideFactor("w"), 0);
-                break;
+            switch (this.direction) {
+                case OpenLayers.Control.Pan.NORTH: 
+                    this.map.pan(0, -getSlideFactor("h"));
+                    break;
+                case OpenLayers.Control.Pan.SOUTH: 
+                    this.map.pan(0, getSlideFactor("h"));
+                    break;
+                case OpenLayers.Control.Pan.WEST: 
+                    this.map.pan(-getSlideFactor("w"), 0);
+                    break;
+                case OpenLayers.Control.Pan.EAST: 
+                    this.map.pan(getSlideFactor("w"), 0);
+                    break;
+            }   
         }
     },