It may be treated as a violation of the basic employee’s duties if an employee performed work in the working establishment while being sick. Supreme Court had to decide if the contract could be terminated without a notice period if there was a violation not against an employer itself but against an employing establishment, which is not only good of an employer, but also a common good of the employees. As a result, taking into consideration that art. 100 § 2 point 4 of the Labour code provides that an employee is obliged to take care of the best interests of the employing establishment, the Supreme Court decided that even in case a where the employee’s presence was in the employer’s best interest, the contract of employment may be terminated without notice if the interest of the “employing establishment” as the community of employer and employees was violated. In this case, this violation was a sick employee present in working establishment.