Loading Scene Progress Total Is 0

[Amethyst17]

When I am loading the scene, the "progress.total" is 0

BABYLON.SceneLoader.Load(folder, fileName, $scope.engine, function (loadedScene) {

    //Do something with the scene

},loadingProgress);

function loadingProgress(progress) {
    var lp = (Math.round((progress.loaded / progress.total) * 100)).toString() + '%';
    $(ls).find('[data-progress="true"]').html(lp);
}

The "progress.loaded" is giving me the correct number, but the "progress.total" is 0. Why is this happening?