Unfortunately, no one can say what they were doing when the crash occurred. The log entry is below. Using the current mod version (0.16.18).
[February 9, 2019 11:20 PM] 290021.925 Error MainLoop.cpp:1035: Exception at tick 30732922: Error while running event blueprint-train::on_built_entity (ID 6)
[February 9, 2019 11:20 PM] blueprint-train/control.lua:813: attempt to perform arithmetic on global 'orientation' (a nil value)
[February 9, 2019 11:20 PM] 290021.926 Info GlobalContext.cpp:696: Waiting for child processes to exit:
[February 9, 2019 11:20 PM] 290021.926 Info ServerMultiplayerManager.cpp:699: mapTick(30732922) changing state from(InGame) to(Failed)
