Where a contract has but a single object and such object is unlawful, whether in whole or in part, or wholly impossible of performance or so vaguely expressed as to be wholly unascertainable, the entire contract is void.
Mont. Code Ann. § 28-2-603
When contract wholly void
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.