Transaxial differential bug

[Titanic4]

I have the problem with transaxial gearboxes. When I try to apply torque to it, console gets spammed with following lua error:

[ERROR] addons/acf-master/lua/entities/acf_gearbox/init.lua:394: attempt to perform arithmetic on a nil value

1. Act - addons/acf-master/lua/entities/acf_gearbox/init.lua:394
2. CalcRPM - addons/acf-master/lua/entities/acf_engine/init.lua:294
3. unknown - addons/acf-master/lua/entities/acf_engine/init.lua:186

It happens on neutral gear(0th gear).
Will be this fixed?

[Redreaper]

Why are you in 0th gear...?