Principle: Where both the parties to an agreement are under a mistake as to a matter of fact essential to the agreement, the agreement is void.
Factual Situation: Roxanne supplies designer clothes to big showrooms and famous cloth houses. Max agrees to buy a certain consignment of only pink designer clothes for his shop due to the pink coloured theme of his famous shop. Issue cropped up when the exclusive pink coloured dresses were not delivered to Max's showroom, but to some other buyer, who had earlier contracted with Roxanne's store and all this was neither in the knowledge of Roxanne nor Max Decide whether the contract between Roxanne and Max is void?