Bug in the GUI from the list of multiplayer servers

The buttons "Edit" and "Delete" are activated when a world LAN is selected, if you click on "Direct Connection" and then "Cancel", we will return to the previous menu with the selected LAN game, but with the buttons available.

If we click on any of them the game collapses, generating a Crash Report

Normally when you select a LAN world, those buttons are disabled preventing the player to click on them.

I put some Screenshots and Crash Report:

I have not used a modified version of minecraft, in fact I used the new launcher, so it would be impossible to use mods.

http://imgur.com/HLlP5FC