X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/c930e9176a5a85509c5b0230e2bff5c22a591432..6e39d509471fe9b4e2660e0d1631b350d0c66f40:/examples/ux/RowExpander.js

diff --git a/examples/ux/RowExpander.js b/examples/ux/RowExpander.js
index 377089cc..7d22ae3d 100644
--- a/examples/ux/RowExpander.js
+++ b/examples/ux/RowExpander.js
@@ -1,5 +1,5 @@
 /*!
- * Ext JS Library 3.0.0
+ * Ext JS Library 3.1.0
  * Copyright(c) 2006-2009 Ext JS, LLC
  * licensing@extjs.com
  * http://www.extjs.com/license
@@ -137,10 +137,19 @@ Ext.ux.grid.RowExpander = Ext.extend(Ext.util.Observable, {
     
     // @private    
     onDestroy: function() {
-        this.keyNav.disable();
-        delete this.keyNav;
+        if(this.keyNav){
+            this.keyNav.disable();
+            delete this.keyNav;
+        }
+        /*
+         * A majority of the time, the plugin will be destroyed along with the grid,
+         * which means the mainBody won't be available. On the off chance that the plugin
+         * isn't destroyed with the grid, take care of removing the listener.
+         */
         var mainBody = this.grid.getView().mainBody;
-        mainBody.un('mousedown', this.onMouseDown, this);
+        if(mainBody){
+            mainBody.un('mousedown', this.onMouseDown, this);
+        }
     },
     // @private
     onRowDblClick: function(grid, rowIdx, e) {