24 Pa. Stat. § 337c
When any board of school directors has heretofore contracted for labor, materials and supplies for the school district, the purchase of which by contract is authorized under the provisions of the school laws of the Commonwealth, and the board of school directors has actually received the labor, materials and supplies and they are being used by the school district, if the contract does not evidence any fraud or conspiracy to violate the provisions of the school laws of the Commonwealth and the school district has not suffered any pecuniary loss as the result of the contract, then the contract shall be valid and binding on the school district and payment for the labor, materials and supplies by the school district is hereby authorized, or if payment has been made, it is hereby ratified, notwithstanding the fact that the contract was legally void by reason of the failure to advertise for bids or by reason of defect in the advertising, or by reason of any other defect in compliance with, or in the failure or omission to comply with, the school laws of this Commonwealth regulating the award of contracts for labor, materials and supplies. No board of school directors nor any member thereof shall be surcharged for any payment made on any such contract.
24 P.S. § 337c