What aircraft type is it? If it's a modern jet then 85kg or whatever the standard weight you use will make little difference to the trim of the aircraft. Whilst they are not operating to good practice it's perfectly safe from a weight and balance point of view.
The only other issue is whether the crew are in compliance with their operations manual and local laws and regulations. In our outfit we are required to make a note of the staff member and their staff number on the load sheets. With a copy being left behind at the station we depart from this ensures that the emergency services can account for us all in the case of a mishap.