Error while running event simple_train_fuel_stop::on_tick (ID 0)
simple_train_fuel_stop/script/trains.lua:53: bad argument #1 of 3 to 'find' (string expected, got nil)
stack traceback:
[C]: in function 'find'
simple_train_fuel_stop/script/trains.lua:53: in function 'CheckTrainScheduleRecords'
simple_train_fuel_stop/script/trains.lua:76: in function 'AddToShedule'
simple_train_fuel_stop/script/trains.lua:94: in function 'CheckTrains'
simple_train_fuel_stop/script/trains.lua:101: in function 'func'
simple_train_fuel_stop/control.lua:36: in function <simple_train_fuel_stop/control.lua:34>

edit: happened also without this condition:

Error while running event simple_train_fuel_stop::on_tick (ID 0)
simple_train_fuel_stop/script/trains.lua:53: bad argument #1 of 3 to 'find' (string expected, got nil)
stack traceback:
[C]: in function 'find'
simple_train_fuel_stop/script/trains.lua:53: in function 'CheckTrainScheduleRecords'
simple_train_fuel_stop/script/trains.lua:76: in function 'AddToShedule'
simple_train_fuel_stop/script/trains.lua:94: in function 'CheckTrains'
simple_train_fuel_stop/script/trains.lua:101: in function 'func'
simple_train_fuel_stop/control.lua:36: in function <simple_train_fuel_stop/control.lua:34>

Hello, thanks for your information!
I fixed the bug in the last update, so it should not happen again. Also it was not intended to change the wati condition on these temporary fuel stops manually. In my last update, I introduced an advanced option to change this if needed.
Tell me if everyting works as you like!