Fairly Simple Question

Any help would be great...

I want to click an Actor and add +1 to score but only when another actor is on screen.
So I created a Boolean for when the other actor is on screen.
My problem is when I click the actor, if I click real fast I can get more than +1
I kill the actor when Clicked then add +1... But as stated if im fast I can get more than +1
Im sure I can figure it out but my heads all over today, so why not ask you fine folks

Screenshot added

Cheers Mike

You can make another boolean to check if the actor can be clicked.. set it to false when clicked...  also try moving this code to when mouse released

I did try the 'when Released' but that didnt change anything really...
Ok well I can try summit like your first suggestion.
Thanks for the reply