Pressing Shift+Down in a server selection screen will crash the game if no server is selected

Pressing a key combination of Shift+DownArrow in a multiplayer server selection screen will crash the game if no server is selected with the selection frame. Also happens on versions prior to 1.5 (at least 1.4.7).
The attached crash log has been produced using the 13w24a snapshot, but can also be produced by the release versions.