California Code, Business and Professions Code - BPC § 7125.1

(a) The registrar shall accept a certificate required by Section 7125 as of the effective date shown on the certificate, if the certificate is received by the registrar within 90 days after that date, and shall reinstate the license to which the certificate pertains, if otherwise eligible, retroactive to the effective date of the certificate.

(b) Notwithstanding subdivision (a), the registrar shall accept the certificate as of the effective date shown on the certificate, even if the certificate is not received by the registrar within 90 days after that date, upon a showing by the licensee, on a form acceptable to the registrar, that the failure to have a certificate on file was due to circumstances beyond the control of the licensee. The registrar shall reinstate the license to which the certificate pertains, if otherwise eligible, retroactive to the effective date of the certificate.