Reproduction Steps

It's very hard for me to explain anything here. I was playing Hypixel and after getting a kill, my game abruptly crashed. It didn't stop responding or anything, it just said "Saving world..." or something like that, and closed. The crash report was generated though, so that is attached.

Crash Report File

click here

Additional Information

The build I was using was this one.

I believe this is a duplicate of #587

If I'm interpreting that bug correctly, this isn't a duplicate. I was above Y = 60.

If it wasn't you then it looks like another player fell below Y = 0 and caused the crash. Good to confirm it's caused by other players (/entities?), still the same crash though.