The part had been removed by an employee who was unaware of the necessity to notify the printer that the part had been removed.
That it is not possible to prevent damage to the printer sounds reasonable, but as GregValiant said, I can see through the camera if something has already been started. The problem arose when I aborted the printing process about 3 seconds after I realized I had forgotten something in my design. Nothing happened in that short period of time. But the printer did not return to the idle state. I imagine it must be possible to recognize that nothing has been printed yet.
Can you tell me where I can read more about the mentioned possibility via SSH to give this command. That sounds like the solution to this problem.