https://gist.github.com/ProsperCraft/ecf9efd1f34435e81d2e04635b9ea72e

java.lang.NullPointerException
at cam72cam.immersiverailroading.tile.TileRailBase.writeToNBT(TileRailBase.java:290)
at cam72cam.immersiverailroading.tile.SyncdTileEntity.getUpdateTag(SyncdTileEntity.java:71)

Trying to get answers from the town owner.

What were you doing just before the crash occurred? That's a very strange crash.

Did someone try to auto place track using a ex-u placer or similar?

1:00 AM] Geigren (Esiglos): I was not, I have a small rail system going around my town, auto filling my engine with water and charcoal blocks, auto filling + emptying a tank car of crude oil, and a cargo car of charcoal blocks
[1:03 AM] Geigren (Esiglos): This system has been up and running for several months now, i recently however re-arranged some of the fluid/item loader/unloaders

I think I've fixed this, let me know if the problem persists