jQuery Isotope RTL

I'm using this code to run Isotope with RTL support

$.Isotope.prototype._positionAbs = function( x, y ) {
  return { right: x, top: y };
};

$('.portfolio-isotope').each(function() {
    var layoutMode = $(this).attr('data-layoutmode');
    if(!layoutMode || layoutMode === ""){
        layoutMode = 'fitRows';
    }

    $(this).isotope({
        transformsEnabled: false,
        itemSelector: '.portfolio-element',
        layoutMode : layoutMode,
        transitionDuration : '0.8s'
    });

});

For some reason I'm getting the browser returns JavaScript error

Uncaught TypeError: Cannot read property 'prototype' of undefined

What might be the reason for that ?

just use this option isOriginLeft: false

and css

.isotope .isotope-item 
{
  -webkit-transition-property: right, top, -webkit-transform, opacity;
     -moz-transition-property: right, top, -moz-transform, opacity;
      -ms-transition-property: right, top, -ms-transform, opacity;
       -o-transition-property: right, top, -o-transform, opacity;
          transition-property: right, top, transform, opacity;
}