(T)he void sentence rule was founded on the theory that an order that does not conform to [a] statute is entirely void, i.e., “from its inception a complete nullity and without legal effect.” The idea that a long-settled sentence may become not just erroneous, but entirely void, creates intolerable paradoxes in the law. — Kristopher Classen & Jack O’Malley, “Filling the Void: The Case for Repudiating and Replacing Illinois’ Void Sentence Rule,” 42 LOY. U. CHI. L.J. 427, 440 …