Cal. Fin. Code § 22754

No provision imposing liability under this division, including the provisions of subdivision (a) of Section 22751 and subdivision (a) of Section 22752, shall apply to any act done or omitted in good faith in conformity with any written general rule, regulation, or specific ruling of the commissioner, notwithstanding that after the act or omission has occurred, the written general rule, regulation, or specific ruling is amended, rescinded, or determined by judicial or other authority to be invalid for any reason.