35 ILCS 516/125
No computation of the tax on a mobile home or charge for any of the taxes shall be considered illegal on account of any irregularity in the computation, or on account of the computation not having been made within the time required by law, or on account of the mobile home having been charged 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 computation 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 computation thereof. Any irregularity or informality in the computation of the tax, or in any of the proceedings connected with the computation of the taxes, or any omission or defective act of any other officer or officers connected with the computation 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.
35 ILCS 516/125