or while running event Concreep::on_configuration_changed
LuaEntity API call when LuaEntity was invalid.
stack traceback:
Concreep/control.lua:371: in function 'addPort'
Concreep/control.lua:404: in function <Concreep/control.lua:390>
stack traceback:
[C]: in function 'index'
__Concreep/control.lua:371: in function 'addPort'
Concreep/control.lua:404: in function <Concreep/control.lua:390>