Liability Under Guaranty Of Illegal Contract Or Contract Void Against Principal

Mont. Code Ann. § 28-11-203, under Guaranty -- Liability and Exoneration of Guarantor.

Mont. Code Ann. § 28-11-203

A guarantor is not liable if the contract of the principal is unlawful, but the guarantor is liable notwithstanding any mere personal disability of the principal, even though the disability would make the contract void against the principal.