rem: this.tile.destroy(); this.tile = null; 
add: if (this.tile) { this.tile.destroy(); this.tile = null; } 
context:     destroy: function() {        this.tile.destroy();        this.tile = null;            OpenLayers.Layer.HTTPRequest.prototype.destroy.apply(this, arguments);    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/99eaf40e5c0e23de600da876547481c2433fdc63/Untiled.js/clean/lib/OpenLayers/Layer/WMS/Untiled.js