Uncaught TypeError: Cannot read property 'parentNode' of null javascript -

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this code should make element disappear list when dropped on element (called cookiemonster)

addevent(cookiemonster, 'drop', function (e) {   if (e.stoppropagation) e.stoppropagation();    var el = document.getelementbyid(e.datatransfer.getdata('text'));   el.parentnode.removechild(el);   return false; });

create auxiliar variable this

addevent(cookiemonster, 'drop', function (e) {     if (e.stoppropagation) e.stoppropagation();      var el = document.getelementbyid(e.datatransfer.getdata('text'));     var aux = el.parentnode;     aux.removechild(el);     return false; });

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