loadFromJSON is not loading fill options for grupped objects, how to fix that?

Here is mine code

    var canvas = new fabric.Canvas("canvas");
    var canvas2 = new fabric.Canvas("canvas2");


 var circle = new fabric.Circle({radius: 100,fill: 'red',top:100,left:100});
 var path = new fabric.Path('M 0 0 L 0 100 L 50 50 z',{ left: 20, top: 120,fill:"blue"});



var all= new fabric.Group([path,circle]);
canvas.add(all);
var asd=JSON.stringify(canvas);

canvas2.loadFromJSON(asd, function(){
canvas2.renderAll();
});

On canvas 1 i have a blue path object grupped with rec circle, and it works, but when I "loadFromJSON" i have two black objects grupped together ! How to fix that ?