Put the summary of the bug you're having here

What I expected to happen was when going multiplayer to play...:
Describe what you thought should happen here going in the server

What actually happened was...: crashes in versions 1.9
Describe what happened here just crash giving me error.
Tried with older java increased java memory no result.
See bug file
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...