A guarantor is not liable if the contract of the principal is unlawful; but he is liable notwithstanding any mere personal disability of the principal, though the disability be such as to make the contract void against the principal.
Okla. Stat. tit. 15, § 335
Guarantor not liable on unlawful contract - Disability of principal
R.L.1910, § 1040.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.