It has been held that a court or commission has no power to entertain proceedings for approval of an agreement as to workmen's compensation except such as is conferred by statute. Boyko v. Federated Metals Corp., 164 A. 462, 9 11 N.J. Misc. 82, affirmed 168 A. 672, 11 N.J. Misc. 807; Earl W. Baker Co. v. Denney, 158 Okla. 266, 13 P.2d 80, and that an approval of an agreement forbidden by the public policy of the state is voidable if not void. Boyko v. Federated Metals Corp., supra.