Where by an agreement with the insured, or by the terms of a fire insurance policy taken out by a mortgagor, the whole or any part of the loss thereon is payable to a mortgagee of the property for his benefit, the company shall, upon satisfactory proof of the rights and title of the parties, in accordance with such terms or agreement, pay all mortgagees protected by such policy in the order of their priority of claim, as their claims appear, not beyond the amount for which the company is liable, and such payments are, to the extent thereof, payment and satisfaction of the liabilities of the company under the policy. Any payment due by the insuring company to mortgagees or loss payees under the terms of the policy shall be made within 90 days of the loss or within 60 days of the filing of proof of loss, whichever is the longer period; provided, the payment of or settlement of the claim of the mortgagee or loss payee under the policy shall in no way constitute an admission of liability as to the  insured and the fact of such payment or settlement shall be inadmissible in any action at law. (1899, c. 54, s. 41; Rev., s. 4757; C.S., s. 6420; 1969, c. 1077, s. 1.)