CLEO Help Check if car is occupied

[monday]

Is there any simple opcode to check that?
I found this:
0431: is_car_passenger_seat_free $TEMPVAR_ACTOR_CAR seat 0
But it doesn't work for the driver

 

[Opcode.eXe]

046C: 0@ = car 1@ driver
IF
056D:  actor 0@ defined
then
// car 1@ has a driver!

 

[monday]

Thank you