Section 9. No applications for standard rent in certain circumstances.

No court shall, upon an application or in any suit or proceedings, fix the standard rent of any premises under section 8, or entertain any plea that the rent or increases are excessive, if the standard rent or the permitted increase in respect of the same premises have been duly fixed by a competent court on the merits of the case, without any fraud or collusion or an error of the fact, and there has been no structural alternations or change in the amenities or in respect of any other factors which are relevant to the fixation of the standard rent, or change in such increases, thereafter in the premises.