California Code, Family Code - FAM § 2210

(a) The party who commences the proceeding or on whose behalf the proceeding is commenced was under 18 years of age, unless the party entered into the marriage pursuant to Section 302 or 303.

(b) The spouse of either party was living and the marriage with that spouse was then in force and that spouse (1) was absent and not known to the party commencing the proceeding to be living for a period of five successive years immediately preceding the subsequent marriage for which the judgment of nullity is sought or (2) was generally reputed or believed by the party commencing the proceeding to be dead at the time the subsequent marriage was contracted.

(c) Either party was of unsound mind, unless the party of unsound mind, after coming to reason, freely cohabited with the other as his or her spouse.

(d) The consent of either party was obtained by fraud, unless the party whose consent was obtained by fraud afterwards, with full knowledge of the facts constituting the fraud, freely cohabited with the other as his or her spouse.

(e) The consent of either party was obtained by force, unless the party whose consent was obtained by force afterwards freely cohabited with the other as his or her spouse.

(f) Either party was, at the time of marriage, physically incapable of entering into the marriage state, and that incapacity continues, and appears to be incurable.