[SOLVED] Create an actor just once?

Probably very basic, but I'm having some trouble and can't figure this out.  I'd like to create an actor (pop-up menu)  after a level completion (when the player enters a region)  but my current behavior creates infinite amounts of the actor and crashes the game.  I'd like to create just 1.  Any help?

Assign the last created aactor to an actor attribute, and only execute the code when that actor attribute has no value.

Another simple way of doing this is to delete the finish region.

Assign the last created aactor to an actor attribute, and only execute the code when that actor attribute has no value.

Took me a while to figure this out but I got it to work.  Thanks