Najmi, a 15-year-old boy became an orphan after both of his parents died in a tragic car accident in January 2018. His uncle, Pak Mat is now taking care of him and managing all the properties left by his late parents. Pak Mat is planning to sell one of the properties located at Mantin Negeri Sembilan. He later met Faisal to make a valuation as to the price of the property. Faisal discovered that the price value is lower and advise Pak Mat not to sell the property. Pak Mat however still wants to proceed with his plan and managed to sell it to Ricky. Advise Najmi on the validity of the contract. Support your answer with relevant legal provisions and decided case law