Section 17. Relief against default in payment of installments.

(1) Where a decree for payment of a decretal amount by installments contains a provision that in default of one or more installments, the whole amount shall become due at once, then, notwithstanding anything in such provision, nonpayment of any installment falling due during the period in which the proceedings in execution remain stayed 1[under this Chapter,] shall not be deemed to be a default for the purposes of such provision. (2) If the judgment-debtor pays the installments so falling within a period of twelve months 2[after the expiry of this Chapter,] then such installment shall be deemed to have been paid on the due date.