Error while running event Train_Alerts::on_train_changed_state (ID 23)
Train_Alerts/script/train_state_monitor.lua:48: attempt to index field 'station' (a nil value)
stack traceback:
Train_Alerts/script/train_state_monitor.lua:48: in function 'start_monitoring'
Train_Alerts/script/train_state_monitor.lua:176: in function 'handler'
Train_Alerts/control.lua:56: in function <Train_Alerts/control.lua:54>

I'm not sure if the alert GUI was open when it died.

Was a train arriving at a temporary stop around that time? I forgot that those are a thing... :oops: Will be fixed shortly.