2152.468 Error MainLoop.cpp:1223: Exception at tick 18087110: The mod Automatic Train Fuel Stop caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FuelTrainStop::on_entity_renamed (ID 57)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
FuelTrainStop/control.lua:153: in function <FuelTrainStop/control.lua:149>
stack traceback:
[C]: in function 'newindex'
__FuelTrainStop/control.lua:153: in function <FuelTrainStop/control.lua:149>
2152.468 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "The mod Automatic Train Fuel Stop caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FuelTrainStop::on_entity_renamed (ID 57)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
FuelTrainStop/control.lua:153: in function <FuelTrainStop/control.lua:149>
stack traceback:
[C]: in function 'newindex'
__FuelTrainStop/control.lua:153: in function <FuelTrainStop/control.lua:149>"

After some more research, this seems to have been reported three months ago already without any reaction (and the mod therefore seems no longer actively maintained).

The above was wrong, it is maintained, and this was fixed after one day. Or three months, depending on how you see it, but fixed. Thanks!