(Sorry for my bad english)
i Play Factorio with the Mod Krastorio. If i kill the Tank from Krastorio this message appears.

Error while running event vehicle_physics::on_tick (ID 0)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
vehicle_physics/control.lua:89: in function <vehicle_physics/control.lua:87>
stack traceback:
[C]: in function 'index'
__vehicle_physics/control.lua:89: in function <vehicle_physics/control.lua:87>

thanks its fixed now

let me know how you find the new sounds

Well done dude.
One of my new favourite mod :)