The invention relates to an improved anti-trap protection system for a vehicle window (2) in a vehicle door (1), which can be adjusted by means of a window regulator motor (14) and is displaced into a closed position using a closing aid (22). As the vehicle window (2) is adjusted, a test variable (n) characteristic of the motor load is continuously recorded and compared to a threshold value (ns). The adjustment of the vehicle window (2) is stopped or reversed if this test variable (n) exceeds the threshold value (ns). In addition, a state signal (SB) characteristic of the state of activity of the closing aid (22) is recorded. The threshold value (ns) is set differently depending on the state signal (SB).