Put the summary of the bug you're having here

What I expected to happen was...:
Was i played with a friend in a local map, we finished to play on my map.

What actually happened was...:
When i want to save my game, i clic save, but nothing happen (no home menu) and MC crashes.

Steps to Reproduce:
1. Create a new map
2. Start local multiplayer
3. Invite at least one player
4. Try to save your savefile when you're in game with your friend