Runtime error #1069 in MobileSkin class on focus out

Hiting tab to move focus away from component which has pure AS skin without hostComponent property defined results in runtime error.

Error happens in the endHighlightBitmapCapture of MobileSkin:
public function endHighlightBitmapCapture():Boolean
{
var exclusions:Array = focusSkinExclusions;
if (!exclusions)

{ if (this["hostComponent"] is SkinnableComponent) exclusions = SkinnableComponent(this["hostComponent"]).suggestedFocusSkinExclusions; }

Note that property accessed as dynamic property but there is no check for property existence. It should be there just like in case of beginHighlightBitmapCapture:
public function beginHighlightBitmapCapture():Boolean
{
var exclusions:Array = focusSkinExclusions;
if (!exclusions)

{ if (("hostComponent" in this) && this["hostComponent"] is SkinnableComponent) exclusions = SkinnableComponent(this["hostComponent"]).suggestedFocusSkinExclusions; }