How do I make trigger once on touch of object?

I got a sprite that should trigger an event on touch once, when a certain condition is met. For that I created a sub-event with the condition and the additional condition "Trigger once when true". However, every time I touch the sprite, it triggers the event and the subevent always gets considered "first time trigger". how can I make sure that an action is only triggered once, when I tap on a sprite, without creating a global bool for every of them? I use it a lot.

You will need the bool or a variable so you can make the condition false. If you have too many objects consider using a Family with a Family instance variable then you can use one event that applies to everything.