Crash minecraft quand je rentre sur un serveur.

bonjour ! je viens de passer en 1.8 et lorsque j'essais de rejoindre un serveur en 1.8, sa marche, je reste 1 seconde sur le serveur et mon minecraft plante... voici le message d'erreur :

[22:13:43] [Client thread/INFO]: Setting user: lynkero
[22:13:43] [Client thread/INFO]: (Session ID is token:8e142e69c96e46aabafedce6ffe29e2a:c88218a0b7cd4ffc81b1d5792a591b14)
[22:13:45] [Client thread/INFO]: LWJGL Version: 2.9.1
[22:13:45] [Client thread/INFO]: Reloading ResourceManager: Default
[22:13:46] [Sound Library Loader/INFO]: Starting up SoundSystem...
[22:13:46] [Client thread/WARN]: File minecraft:sounds/mob/ghast/fireball.ogg does not exist, cannot add it to event minecraft:item.fireCharge.use
[22:13:46] [Thread-6/INFO]: Initializing LWJGL OpenAL
[22:13:46] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[22:13:46] [Thread-6/INFO]: OpenAL initialized.
[22:13:47] [Sound Library Loader/INFO]: Sound engine started
[22:13:48] [Client thread/INFO]: Created: 512x512 textures-atlas
[22:13:51] [Client thread/ERROR]: Can't ping mc.zambies.net: Internal Exception: io.netty.handler.codec.DecoderException: java.lang.IllegalArgumentException: Invalid UUID string: 102703c8e86545aab4300f8753526e14
[22:13:54] [Client thread/INFO]: Connecting to Minecavemc.com, 25565
[22:14:00] [Client thread/INFO]: [CHAT]
[22:14:00] [Client thread/INFO]: [CHAT] [LOTTERY] Draw in: 54 minutes, and 17 seconds
[22:14:00] [Client thread/INFO]: [CHAT] You have no new mail.
[22:14:00] [Client thread/INFO]: [CHAT] [#] lynkero joined the game.
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0000000000000001, pid=9388, tid=3640
#
# JRE version: 6.0_30-b12
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.5-b03 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C 0x0000000000000001
#
# An error report file with more information is saved as:
# C:\Users\vladislas\AppData\Roaming\.minecraft\hs_err_pid9388.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#
AL lib: (EE) alc_cleanup: 1 device not closed

[error occurred during error reporting , id 0xc0000005]

voila j'espère que vous pourrez m'aider... au revoir !