Why I cannot destroy viewport on zoomed end event?

[devexus]

I want to change the view when I reach the set scale. I try to remove the viewport from the Pixi children and then run the destroy method. I received an error.

[blnvdanil]

Simply because events are fired synchronously, and inside of viewport it has some other code to do after it fired zoom-end event. Destroy method does something like this.transform = null on display object, but viewport accesses position of the object, which is null, after it fired the event, and we have cannot get properties of null exception