Hey. Server console suddenly started spewing out a lot of these:

[20:50:17] [Server thread/WARN] [universalmodcore]: Multiblock TE is null: BlockPos{x=352, y=69, z=-385} BlockPos{x=3, y=7, z=0} false class cam72cam.immersiverailroading.multiblock.CastingMultiblock$CastingInstance

When teleported there, there was this casting thing that had a texture but no complete hitbox. After destroying parts of it and a piece of pipe somewhere in the area the server crashed and now even after restart keeps crashing everytime anyone gets near.

Crash report:
https://pastebin.com/XPrW4B2v

After attempting to remove that multiblock's entries from map with NBTexplorer to make the server playable again, immediately after server startup still one or two of these show up:

[16:16:20 WARN]: Multiblock TE is null: BlockPos{x=352, y=69, z=-385} BlockPos{x=3, y=7, z=0} false class cam72cam.immersiverailroading.multiblock.CastingMultiblock$CastingInstance

(still on the same coords that I removed stuff from, but maybe I'm just dumb and did not succeed)
And immediately after that the server crashes.

Practically identical crash report:
https://pastebin.com/j8ad29eq

Ah, looks very similar to #716
Note, testing of that fix applied for #716 didn't resolve it possibly something else being oddball, or it is in a bad state.

Just to give you more information @Avalkiz
Building of current source will fix your issue, or at least identify where you problem is occurring.

This will be fixed in the next release. For now you can use the build from https://github.com/TeamOpenIndustry/ImmersiveRailroading/suites/414190996/artifacts/1273019