A frustrating event typically occurs between contract formation and the expected time of performance
where this occurs, contract is frustrated and non performance doesn't allow a claim
Definition = if a party to a contract was prevented from keeping the promise because of an unforeseeable, intervening event, he or she wouldn't be liable for a breach of contract - Taylor v Caldwell -
A contract is frustrated if both parties face an unforeseeable intervening event which wasn't in their control