Except as provided in sections seven hundred nineteen and seven hundred twenty of this chapter, and except any action or proceeding brought by the attorney general or, in the case of a charitable trust, an action or proceeding against a trustee brought by a beneficiary of such trust, no person serving without compensation as a director, officer, key person or trustee of a corporation, association, organization or trust described in section 501 (c) (3) of the United States internal revenue code shall be liable to any person other than such corporation, association, organization or trust based solely on his or her conduct in the execution of such office unless the conduct of such director, officer, key person or trustee with respect to the person asserting liability constituted gross negligence or was intended to cause the resulting harm to the person asserting such liability. For purposes of this section, such a director, officer, key person or trustee shall not be considered compensated solely by reason of payment of his or her actual expenses incurred in attending meetings or otherwise in the execution of such office.