Game ended with bad state (exit code 255)

[09:33:00 INFO]: Client> [09:33:00] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-07-18_09.32.59.png
[09:33:01 INFO]: Client> [09:33:01] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 3399ms behind, skipping 67 tick(s)
[09:33:01 INFO]: Client> [09:33:01] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-07-18_09.33.01.png
[09:33:03 INFO]: Client> [09:33:03] [Client thread/INFO]: [CHAT] Saved screenshot as 2014-07-18_09.33.02.png
[09:33:26 ERROR]: Game ended with bad state (exit code 255)
[09:33:26 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[09:33:26 INFO]: Deleting C:\Users\Vaclav\AppData\Roaming\.minecraft\versions\14w29b\14w29b-natives-644315926585591
[09:33:26 WARN]: Couldn't delete C:\Users\Vaclav\AppData\Roaming\.minecraft\versions\14w29b\14w29b-natives-644315926585591 - scheduling for deletion upon exit