If any promisee neglects or refuses to afford the promisor reasonable facilities for the performance of his promise, the promisor is excused by such neglect or refusal as to any non-performance caused thereby.

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Illustration

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A contracts with B to repair B's house.

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B neglects or refuses to point out to A the places in which his house requires repair.

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A is excused for the non-performance of the contract if it is caused by such neglect or refusal.