Found it. Stable Spigot was able to catch the error, it's corrupted map data causing exceptions in a server tick loop :/ EDIT: Fixed. Running back on PaperSpigot with my own modifcations and optimizations. So far so good, no crashes, NPEs, or errors. Pretty smooth, aside from my own latency to the server due to distance. WorldEdit and VoxelSniper run VERY fast. Did some work, gonna call it a night. Might make another update thread about it once I get a bunch of stuff done.