8. No suit, defence or exception, founded upon the omission of any formality, even imperative, in any act of the council of a municipality or of the Regional Government, of the executive committee or of an officer of a municipality or the Regional Government, shall prevail, unless the omission has caused actual prejudice or it is of a formality whose omission, according to the provisions of the law, would render null the proceeding from which it was omitted.
1978, c. 87, s. 8; 1996, c. 2, s. 1105.