Wassenaar worked for Panos under a three-year contract stating that if the contract were terminated wrongfully by Panos before the end of the three years, he would pay as damages the salary for the remaining time that the contract had to run. After three months, Panos terminated the contract, and Wassenaar sued him for pay for the balance of the contract term. Panos claimed that this amount could not be recovered because the contract provision for the payment was a void penalty. Was this provision valid? [Wassenaar v Panos, 331 NW2d 357 (Wis)]