Spawn object with mouse

Hello, I have a problem with construct2 indeed when I add an event, so if I click with the mouse it makes appear a crate after one second, but if I press full of times on the mouse it spawn full of cash, while the variable is supposed to turn off, so it should not cause more crates, if someone has an idea, thank you

s22.postimg.cc/besfsoxtd/Capture.png

Sorry for my bad english, i'm french

Trigger once...

Hello, no in fact the problem is the layers is hidden but the button remains clickable, how can I disable this?