Customizer/Theme Options/Section Sorter – do not work

Is there a problem with the section sorter? It doesn't work at all. There is also an error occurred in inspect view (file: customize-custom-controls.min.js): $(function(){$(".custom-sortable").sortable({cursor:"move",stop:function(t,o){$(this).next().val($(this).sortable("toArray")).trigger("change")}}).disableSelection()}); The second $ seems to be not in correct position?! Does any body know an answer here? Thanks a lot!