(15) If default is made in payment of any instalment due in pursuance of the composition or scheme, or if it appears to the Court, on satisfactory evidence, that the composition or scheme cannot, in consequence of legal difficulties, or for any sufficient cause, proceed without injustice or undue delay to the creditors or the debtor, or that the approval of the Court was obtained by fraud, the Court may, if it thinks fit, on application by the receiver or the trustee or by any creditor, adjudge the debtor bankrupt, and annul the composition or scheme, but without prejudice to the validity of any sale, disposition or payment duly made, or thing duly done, under or in pursuance of the composition or scheme. When a debtor is adjudged a bankrupt hereunder, any debt provable in other respects, which has been contracted before the adjudication, shall be provable in the bankruptcy.