Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE)

My problem :

uncaught exception: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIDOMCanvasRenderingContext2D.drawImage]"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: file:///***************.js :: redrawView :: line 308"  data: no]

The code which produce this behaviour (tmpImg is loading dynamically, so if it is not loaded yet, it skip it).

if(tmpImg!=null && tmpImg.img.complete===true && tmpImg.img.src!=null){
    var tmpPos = i_getCoordsImage(tmpImg);
    var rect = getRectInCurrentView(tmpPos.x,tmpPos.y,tmpPos.w,tmpPos.h);
    console.log(tmpImg);
    console.log(rect);
    mainDisplayContext.drawImage(tmpImg.img,rect.x,rect.y,rect.w,rect.h);
}

The problem happens several times when the tmpImg is just loaded (a least according to Firebug's log), and then disappear.
The code snippet is called several times in a row, so I can't see if the image is actually displayed when the error is thrown.
The value in rect.* are floating point, something like {x:-1500, y:-2500,h:1000,w:1000}

Do you have any idea about the origin of this error ?

Edit 1

This code produce the error (you need to have an image named "test.png" in the same directory

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fr">
<head>
    <meta charset="UTF-8" />
</head>
<body id="body">
    <canvas id="canvas" width="600" height="600"></canvas>
    <script>
    //[CDATA[
        var img = new Image();
        var mdc = document.getElementById("canvas").getContext("2d");
        function displayCallback(){
            if(img.complete===true && img.src!=null){
                mdc.drawImage(img,0,0,600,600);
            }
            setTimeout(displayCallback, 50);
        }
        setTimeout(function(){img.src = "test.png";}, 10000);
        setTimeout(displayCallback, 1000);
    //]]
    </script>
</body>
</html>

It seems related to the fact that the empty image has a src propriety of "". Is it always true ?

edit 2

In fact, for the bug reporting, this JavaScript would suffice (if I understood) :

document.getElementById("canvas").getContext("2d").drawImage(new Image(),0,0);