loading into an in-progress game resulted in this error:
The mod Underground Transport (0.1.8) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event UndergroundTransport::on_tick (ID 0)
LuaItemStack API call when LuaItemStack was invalid for read.
stack traceback:
[C]: in function 'index'
__UndergroundTransport/scripts/util.lua:68: in function 'itemFilterToKey'
UndergroundTransport/scripts/network.lua:219: in function 'removeItem'
UndergroundTransport/scripts/network.lua:153: in function 'tick'
UndergroundTransport/control.lua:11: in function <UndergroundTransport/control.lua:10>
