California Code, Code of Civil Procedure - CCP § 995.380

(a) If a bond does not contain the substantial matter or conditions required by this chapter or by the statute providing for the bond, or if there are any defects in the giving or filing of the bond, the bond is not void so as to release the principal and sureties from liability.

(b) The beneficiary may, in proceedings to enforce the liability on the bond, suggest the defect in the bond, or its giving or filing, and enforce the liability against the principal and the persons who intended to become and were included as sureties on the bond.