Logged into minecraft, clicked on a server, game crashed.

I thought it would log me into the server but instead the game crashed.

The game closed out and brought up a screen telling me a detailed summary of the bug error and giving me the options to report or other options.

1. Start up the game and run on 1.7.9 or 1.7.10.
2. Hit "multiplayer", and select a server, this one specifically KrunchyKraft that has been lagging and crashing very frequently.
3. The game should close out abruptly and open a window about the bug.