JavaScript FabricJS v. 2 beta – enable disable filter

I am trying to apply and remove a filter to my active object. My code will apply the filter but will not remove it:

 $scope.contrastFilter = function () {
        var obj = canvas.getActiveObject();
        if (!obj) return;

        if (obj.filters.Contrast) {
            obj.filters.Contrast = null;
        } else {
            obj.applyFilters([ new fabric.Image.filters.Contrast({ contrast: 15 })]);
        }
        canvas.renderAll();
   };
Answer:1

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