Game freezes on quit

When I exit out of Minecraft after opening the game to LAN the game always freezes when I quit, forcing me to use the task manager to close the game.

What I expected to happen was...:
When I quit the game I expected it to quit to the desktop.

What actually happened was...:
When I exit the game it freezes my system causing me to have to use task manager to close the game.

Steps to Reproduce:
1. Start a game
2. Open it to LAN
3. Try to quit the game.