Game crashes when i click 'save and quit'.

The game just crashes once in a while when i am saving a world..

It happens only once in a while and probably only when my net is down and i'm hosting a lan world. I don't think i've seen it happen any other time.

Steps to Reproduce:
1. Run game
2. Open a new world, and open it to lan.
3. Get someone to join the world and disconnect from it.
4. then turn of your internet connection.
5. click save and quit.