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.prototype.destroy.apply(this, arguments);    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/905bd6d441edd982bbaabbef2f9b5c685a17f049/Image.js/clean/lib/OpenLayers/Layer/Image.js