The latest version crashes with the following message when entering a locomotive:

Error while running event GCKI::on_player_driving_changed_state (ID 26)
Entity is not car.
stack traceback:
GCKI/common.lua:192: in function 'get_occupants'
GCKI/control.lua:721: in function <GCKI/control.lua:704>
stack traceback:
[C]: in function 'get_passenger'
GCKI/common.lua:192: in function 'get_occupants'
GCKI/control.lua:721: in function <GCKI/control.lua:704

Of all mods modifying locomotives I use MultipleUnitTrainControl and TrainSkipFulfilledStation.

Upd: also updating to the new version wiped the lock of my car to my keys

Thanks for reporting these bugs! :-)

The latest version crashes with the following message when entering a locomotive:

Error while running event GCKI::on_player_driving_changed_state (ID 26)
Entity is not car.

Apparently, vehicles of the prototype "car" are special because they may have both driver and passenger, while all other vehicles may only have a driver. That should be easy to fix.

Upd: also updating to the new version wiped the lock of my car to my keys

That may take a while, but I'm working on it!

Both bugs should be fixed in 0.17.9. Can you confirm that?

Yep, works purrfect

Thanks!