There are 3 crashes where it dumps the same log.

1. If someone new joins without an UUID in the players list in that world, the server will crash after 5 minutes.
2. If someone dies on the server, the server will crash.
3. If someone joins who havent been on in a long time, the server will also crash. (long time: 1 week away est.)

We have tried without plugins too, and we get the same results.