Usage Detector mode caused an unrecoverable error.
Please report this error to the moderator.
Error while running event usage-detector::on_tick (ID 0) usage-detector/usage_detector.lua:91: attempt to index field '?' (a nil value)
stack traceback: usage-detector/usage_detector.lua:91: in function 'check_progress' usage-detector/usage_detector.lua:104: in function 'onTick' usage-detector/gui.lua:69: in function <usage-detector/gui.lua:63>
Issue fixed so that it no longer crashes, but unfortunately I fixed it by stopping the scanning more or less, so you have to open the GUI, stop it and start it again and it will scan the usage.