After updating to the latest version, I received this error when I started the saved game.
Error while running event BeltUpgrader::on_tick (ID 0)
An area of zero size is not supported. Either don't define area to search the entire surface or use 'position'.
stack traceback:
BeltUpgrader/control.lua:176: in function 'creep'
BeltUpgrader/control.lua:120: in function 'checkRoboports'
BeltUpgrader/control.lua:534: in function <BeltUpgrader/control.lua:529>
