When performance of promise becomes impossible or illegal by occurrence of an unexpected event or change of circumstances beyond the contemplation of parties, the contract becomes void. The situation is dealing with

Supervening impossibility (also known as the doctrine of frustration) occurs when an unforeseen event makes contract performance impossible or illegal after the contract is formed. This is covered under Section 56 of the Indian Contract Act. The key distinction is that the impossibility was not contemplated by the parties at the time of contracting and is due to factors beyond their control.