(35 ILCS 200/21-185)
    Sec. 21-185. Cure of error or informality in assessment rolls or tax list or in the assessment, levy or collection of the taxes. No assessment of property or charge for any of the taxes shall be considered illegal on account of any irregularity in the tax lists or assessment rolls, or on account of the assessment rolls or tax lists not having been made, completed or returned within the time required by law, or on account of the property having been charged or listed in the assessment or tax list without name, or in any other name than that of the rightful owner. No error or informality in the proceedings of any of the officers connected with the assessment, levying or collection of the taxes, not affecting the substantial justice of the tax itself, shall vitiate or in any manner affect the tax or the assessment thereof. Any irregularity or informality in the assessment rolls or tax lists, or in any of the proceedings connected with the assessment or levy of the taxes, or any omission or defective act of any other officer or officers connected with the assessment or levying of the taxes, may be, in the discretion of the court, corrected, supplied and made to conform to law by the court, or by the person (in the presence of the court) from whose neglect or default it was occasioned. Where separate advertisement and application for judgment and order of sale is made on account of delinquent special taxes or special assessments in all cities, villages and incorporated towns in counties with 3,000,000 or more inhabitants, and in cities, villages and incorporated towns in other counties in which the county board by resolution has extended the time in which the return, required in Section 20-100, may be made, the procedure shall, in all respects, be the same as in this section prescribed, except that there shall be 2 separate judgments and orders for sale, one on account of delinquent special taxes and special assessments and the other on account of delinquent general taxes.
(Source: P.A. 84-1275; 88-455.)