zOrderPosition error caused by 'duplicate' and 'move' methods

i created paths , grouped them script.  selected item below them , tried getting zorderposition of script. , got error.

is there way rid of this?

 

here code.

please select path , run test1 or test2 twice.  you'll error @ second time.

(tested ai cs3 , cc 2015)

thanks.

 

function test1(){  // error (at second time)

    var lay = activedocument.activelayer;

    var group = lay.groupitems.add();

    var p1 = lay.pathitems.ellipse(100,100,10,10);

    var p2 = p1.duplicate();

    var p3 = p1.duplicate();

   

    p2.move(group, elementplacement.placeatend);

    p3.move(group, elementplacement.placeatend);

   

    alert(activedocument.selection[0].zorderposition);  // error

}

 

function test2(){  // error (at second time)

    var lay = activedocument.activelayer;

    var group = lay.groupitems.add();

    var p1 = group.pathitems.ellipse(100,100,10,10);

    var p2 = p1.duplicate();

   

    alert(activedocument.selection[0].zorderposition);  // error

}

 

function test3(){  // no error

    var lay = activedocument.activelayer;

    var group = lay.groupitems.add();

    var p1 = lay.pathitems.ellipse(100,100,10,10);

    var p2 = p1.duplicate();

   

    p2.move(group, elementplacement.placeatend);

   

    alert(activedocument.selection[0].zorderposition);  // no error

}

 

test1();

yes, see error. persists if save, close , re-open document. think saw long time ago said zorder broken feature.

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