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SALVATORIAN CLAUSE (noun): a clause in a contract that states that if parts of the contract are held to be illegal or unenforceable, the remainder of the contract should still be valid (Macmillan Dictionary)

Salvatorian Clause. Should a provision of this Agreement be invalid or become invalid or should this Agreement contain an omission, then the legal effect of the other provisions shall not thereby be affected. Instead of the invalid provision a valid provision is deemed to have been agreed upon which comes closest to what the parties intended commercially; the same applies in the case of an omission. (LawInsider)