The mod Noxys Multidirectional Trains (0.5.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Noxys_Multidirectional_Trains::on_train_changed_state (ID 26)
Noxys_Multidirectional_Trains/control.lua:67: attempt to index field 'schedule' (a nil value)
stack traceback:
Noxys_Multidirectional_Trains/control.lua:67: in function 'train_unrotate'
Noxys_Multidirectional_Trains/control.lua:104: in function <Noxys_Multidirectional_Trains/control.lua:92>

What I was doing: I was sitting in a train and switched from automated to manual while still in the train.

I got this in a similar scenario, but while I got in the train from remote view.

I had almost the same error:

Error while running event Noxys_Multidirectional_Trains::on_train_changed_state (ID 30)
Noxys_Multidirectional_Trains/control.lua:67: attempt to index field 'schedule' (a nil value)
stack traceback:
Noxys_Multidirectional_Trains/control.lua:67: in function 'train_unrotate'
Noxys_Multidirectional_Trains/control.lua:104: in function <Noxys_Multidirectional_Trains/control.lua:92>
in remote view: the only way to swtich to manual to resolve a deadlock is to remove all stations, but that results in this error.