When I click Multiplayer button on the main screen of Minecraft it crashes!

When I click Multiplayer button on the main screen of Minecraft it crashes!

What I expected to happen was...:
Enter in multiplayer so I can join a server!

What actually happened was...:
It freezed for a second then it crashed when I clicked multiplayer button!

Steps to Reproduce:
1. Open Minecraft
2. Click Multiplayer!
3. Get the crash message!
Crash report is under the description!