I get this crash whenever I place an electric train on any segment of track. Just yesterday I was using them without any problems, I haven't had any mod updates or other changes since that I am aware of.

The mod Electric Train (0.18.1) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ElectricTrain::on_nth_tick(2)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
ElectricTrain/control.lua:144: in function 'CreateProvider'
ElectricTrain/control.lua:168: in function <ElectricTrain/control.lua:163>
stack traceback:
[C]: in function 'index'
__ElectricTrain/control.lua:144: in function 'CreateProvider'
ElectricTrain/control.lua:168: in function <ElectricTrain/control.lua:163>