javascript - canvas data out of range? problem in FF -

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i run code every frame, works great in chrome 

data[index + 0] = bgdata[dis + 0]; data[index + 1] = bgdata[dis + 1]; data[index + 2] = bgdata[dis + 2]; data[index + 3] = 255;

but firefox gives error:

an invalid or illegal string specified" code: "12

unless add -1 each line below:

data[index + 0] = bgdata[dis + 0] -1; data[index + 1] = bgdata[dis + 1] -1; data[index + 2] = bgdata[dis + 2] -1; data[index + 3] = 255;

any ideas why might happen? trying optimize code as possible, , understand! data shouldn't out of range obtained by:

bgdata = backgroundcanvasctx.getimagedata(mx, 0, 320, 400).data;

update line causes error is:

overlayimagecanvasctx.putimagedata(imgdata, 0, 0);


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