510 ILCS 40/17
If any provision of this Act is declared unconstitutional, or the applicability thereof to any person or circumstance is held invalid, by a court of competent jurisdiction, the constitutionality of the remainder of the Act and the applicability thereof to other persons and circumstances shall not be affected thereby.
(from Ch. 8, par. 33.77)
(Source: P.A. 79-880.)