I disconnected during a game (my internet's fault) and when I clicked reconnect the client crashed. Let me know what info I should post.
This also kind of happened to me. After about 12 reconnect tries I got back into the game, only to have the game crash within 5ish minutes.
Please use the log summit tool with that message so we can hunt this down.
© 2013 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.