rem: this.polygon.destroy(); 
add: if(this.polygon) { this.polygon.destroy(); } 
context:     destroyFeature: function() {        OpenLayers.Handler.Path.prototype.destroyFeature.apply(this);        this.polygon.destroy();        this.polygon = null;    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/7881c2099aa9f0e544d1d01411448d24c1b43694/Polygon.js/clean/lib/OpenLayers/Handler/Polygon.js