California Code, Family Code - FAM § 1840

(a) During a period beginning upon the filing of the petition for conciliation and continuing until 30 days after the hearing of the petition for conciliation, neither spouse shall file a petition for dissolution of marriage, for nullity of a voidable marriage, or for legal separation of the parties.

(b) After the expiration of the period under subdivision (a), if the controversy between the spouses, or the parents, has not been terminated, either spouse may institute a proceeding for dissolution of marriage, for nullity of a voidable marriage, or for legal separation of the parties, or a proceeding to determine custody or visitation of the minor child or children.

(c) The pendency of a proceeding for dissolution of marriage, for nullity of marriage, or for legal separation of the parties, or a proceeding to determine custody or visitation of the minor child or children, does not operate as a bar to the instituting of proceedings for conciliation under this part.