AI stops when Enemy enter in USphere

Hi! I’m creating a girl AI with a USphere (I called it “ViewRangeSphere”) that goes to a Target point and if enemies enter into ViewRangeSphere she stop. If enemies die girl must continue to go to Target point.

I’ve done an Enemies Array that at start is setted with all enemies in level.
When an enemy enter into the ViewRangeSphere girl stop.
But when enemy die she doesn’t continue to walk.
How can I resolve?

PS: When enemy dies and I close the game there is an error: “Cannot access to : (name of enemy). It is pending kill.”