Getting the following fatal error (and it asks to report it :-))

The mod Transport Drones (0.7.12) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Transport_Drones::on_load()
LuaEntity API call when LuaEntity was invalid.
stack traceback:
Transport_Drones/script/depot_common.lua:324: in function 'get_lib'
Transport_Drones/script/depot_common.lua:329: in function 'load_depot'
Transport_Drones/script/depot_common.lua:482: in function 'on_load'
core/lualib/event_handler.lua:79: in function <core/lualib/event_handler.lua:74>
stack traceback:
[C]: in function 'index'
__Transport_Drones/script/depot_common.lua:324: in function 'get_lib'
Transport_Drones/script/depot_common.lua:329: in function 'load_depot'
Transport_Drones/script/depot_common.lua:482: in function 'on_load'
core/lualib/event_handler.lua:79: in function <core/lualib/event_handler.lua:74>

Scenario is switching between same save on Steam between 2 different machines, same mods etc.., worked fine until today.