When a contract has but a single object, and such object is unlawful in whole or in part, or wholly impossible of performance, or so vaguely expressed as to be wholly unascertainable, the entire contract is void.
N.D. Cent. Code § 9-04-03
Unlawful, impossible, or unascertainable object voids contract
Official source: North Dakota Legislative Branch. Reproduced from public-domain North Dakota statutes; confirm against the official source for the current text. Not legal advice.