? error with {tracker}

Like it's said before, when I'm using a ? to recieve a variable from the PC, and that variable +2 or something like that and add it to the tracker it crashes. If I take out the {tracker} then it works perfect. Macro being: /em ?{Which|First,[[1d20-floor((@{selected|AGILITY})/10) &{tracker}]]|Second,[[1d20-floor((@{selected|AGILITY})/10)+1d10]]} Agility is an attribute 

I don't know if it will fix it, but try: /em [[1d20-floor((@{selected|AGILITY})/10)+ ?{Which|First,0|Second,1d10} &{tracker}]]

Yeah, that's what I actually did and it works perfectly, ty