[Customized World Type] Returning to the "Customize" menu can select another biome

All is ok for All to River, but if you select FrozenOcean (the next is FrozenRiver, then it's Ice Plains), then return to the Customize menu : it will select Ice Plains.

So if you select Mesa, il will select Mesa Plateau when returning to the Customize menu.

After all, if you select Mesa Plateau F or Mesa Plateau, it will crash when clicking again on the Customize button : http://pastebin.com/NnYXu3n7