750 ILCS 5/401
(a) The court shall enter a judgment of dissolution of marriage when at the time the action was commenced one of the spouses was a resident of this State or was stationed in this State while a member of the armed services, and the residence or military presence had been maintained for 90 days next preceding the commencement of the action or the making of the finding:
Irreconcilable differences have caused the irretrievable breakdown of the marriage and the court determines that efforts at reconciliation have failed or that future attempts at reconciliation would be impracticable and not in the best interests of the family.
(ii) motion of either party and a finding by the court that appropriate circumstances exist.
The death of a party subsequent to entry of a judgment for dissolution but before judgment on reserved issues shall not abate the proceedings.
If any provision of this Section or its application shall be adjudged unconstitutional or invalid for any reason by any court of competent jurisdiction, that judgment shall not impair, affect or invalidate any other provision or application of this Section, which shall remain in full force and effect.
(from Ch. 40, par. 401)
(Source: P.A. 99-90, eff. 1-1-16.)