If you shift-click a waystone it will crash your game.
Log: https://gist.github.com/Wohlf-craft/f1ff88e4e129f542caad8c4e9e749109
Waystones_1.12.2-4.0.40
Minecraft 1.12.2

It does not crash. It quits the world and closes the game. No crash file.

And even shift click place it. Does the same thing.

This doesn't happen for me and the log you posted doesn't include any reasoning as to why the server was shut down (it seems to "just happen" at 14:11:47).

Does this consistently happen? What does the generated crash-report file say?

Im experiencing the same issue when far away from my spawn, not excessively far but a few hundred blocks out

I need exact steps to reproduce and a mod list including Forge version and the operating system used. Also make sure you're up to date on Java 8.

Shift-clicking or shift-placing a waystone at x1000 y63 z1000 works just fine for me, so any additional information would help.

This is a mod conflict, but with what mod(s) I haven't a clue. I'm guessing one of the mods was catching an exception, swallowing the stacktrace, and instead saving/shutting down the server.

I'm also guessing this issue may no longer even exist, due to updates.

In any case, debugging it is nigh impossible without the entirety of the modpack in which it occurs, if it still occurs. Would need to disable/enable mods to find out where the cause lies.

Closing due to inactivity