Got this error while playing on my server, wasn't even interacting with ElectricTrains at the time

Please report this error to the mod author.

Error while running event ElectricTrains::on_nth_tick(23)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__ElectricTrains/control.lua:182: in function <ElectricTrains/control.lua:173>
5400.630 Error ServerMultiplayerManager.cpp:91: MultiplayerManager failed: "The mod Electric Trains (1.3.2) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ElectricTrains::on_nth_tick(23)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
[C]: in function 'index'
__ElectricTrains/control.lua:182: in function <ElectricTrains/control.lua:173>"

Update: After some extra testing I've discovered that it's due to one of my electric trains taking damage. Originally it was because a stray spitter was shooting it, but I've replicated the issue with a grenade as well.

https://imgur.com/a/pxlC4D7

I've uploaded a new version that should take care of this issue.

Sweet, I'll go give it a try, thank you!