evaluation unit 51 uses the measurement values from a revolution counter which is associated with the hatch drive 4 to calculate the distance a between the border 6 and the closing edge 7 and compares this distance with the critical distance a crit continuously or at regular intervals if the value of the distance a has reached or fallen below the critical distance a crit and the sensor 52 detects an obstacle in the adjustment path region 53 the control and evaluation unit 51 firstly outputs the reversing command x to the hatch drive 4 and secondly initiates the emergency measure in a first embodiment the control and evaluation unit 51 is coupled to the closing aid 16 specifically to the closure aid drive 15 of said closing aid so as to transmit signals to this end in the process the control and evaluation unit 51 outputs a deactivation command d to the closure aid drive 15 as an emergency measure this having the effect of the closing aid not adjusting the latch 12 to its closed position when the tailgate is supposed to reach the preliminary latching position in this case the deactivation command d overrides in particular a tripping command on account of which the closing aid 16 would otherwise be triggered to close.