Adobe Air: scroller throws error when changes focus between different applications

Question

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at spark.components::Scroller/focusInHandler()[E:\\dev\\4.y\\frameworks\\proje         


        

Answer 1

I know this is old but here is a solution that works for me.

dataGrid.scroller.addEventListener(FocusEvent.FOCUS_IN, dataGridFocusInHandler, false, 1);

and

protected function dataGridFocusInHandler(event:FocusEvent):void {
    if(dataGrid.scroller.focusManager == null) {
        event.stopImmediatePropagation();
    }
}

could also been applied to a list I anticipate

Cheers Adz