(1) it is a defense to conspiracy that the actor, after conspiring to commit a crime, prevented the commission of the crime which was the object of the conspiracy, under circumstances manifesting a complete & voluntary renunciation of their criminal purpose. Renunciation by one conspirator doesn't affect the liability of other conspirators who don't not join in the renunciation of the conspiratorial objective

(2) the defense of renunciation is an affirmative defense