440.06  Failure to secure compensation; effect.--Every employer who fails to secure the payment of compensation under this chapter as provided in s. 440.38 may not, in any suit brought against him or her by an employee subject to this chapter to recover damages for injury or death, defend such a suit on the grounds that the injury was caused by the negligence of a fellow servant, that the employee assumed the risk of his or her employment, or that the injury was due to the comparative negligence of the employee.