[HELP]How to make the cmd disable?

I made something like /dm , when player die , he spawn at the place where he typed the cmd /dm , And if he is in /dm then he cannot type anyother cmd except /leave ..

This is what i made ^^



Error



When player dies , he spawn at the place but he can't join /dm , it shows type /leave



can anyone suggest me what to do?



after he is dead , /leave disables...? Can anyone say me?