ComboBox Used to Change Frames

i have couple of programs combobox used change frames.  works okay if combobox held open , mouse pointer moved , forwards repeatedly on options (sort of thing when debugging) error:

 

ypeerror: error #1009: cannot access property or method of null object reference.

  @ fl.controls::combobox/close()

  @ fl.controls::combobox/onlistitemup()

 

this happens on comboboxes options used change frames.  example of code use below

 

calccombo.addeventlistener(event.change, calcselectpage);

function calcselectpage (event:event):void

{

  if (calccombo.selecteditem.label == "flow") {

  gotoandstop(3);

  }

  else if (calccombo.selecteditem.label == "efficiency") {

  gotoandstop(4);

  }

  else if (calccombo.selecteditem.label == "power") {

  gotoandstop(2);

  }

}

 

does know whats going on?

there's bug in animate cc 2017.  think you'll need create own combobox or use earlier version of animate.

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