When an outside, unforeseen event interferes with the performance of a contract, and there is some other way to fulfill the contract, performance is required.

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If an unforeseen event interferes with the performance of a contract but there remains an alternative means to fulfill the contractual obligations, performance is typically still required under the doctrine of frustration of purpose only if the contract becomes impossible to perform or the fundamental reason for entering into the contract has vanished. However, if performance is still possible through alternative means, even if more burdensome or expensive, parties are generally expected to perform their contractual duties.

When an Outside, Unforeseen Event Interferes with the Performance of a Contract