Minecraft 1.6.1 crash within few seconds in the server and minecraft exit out to the launcher

Well I keep on trying to go to multiplayer it always crash after a few seconds it exit out to the launcher without me exiting of minecraft
heres the error.
unexpected error
java.lang.NullPointerException
at bcu.a(SourceFile:308)
at bdn.l_(SourceFile:74)
at bdw.a(SourceFile:57)
at atn.k(SourceFile:1396)
at atn.S(SourceFile:662)
at atn.d(SourceFile:618)
at net.minecraft.client.main.Main.main(SourceFile:101)

OS: Windows 7 (ver 6.1, arch amd64)
Java: 1.7.0_21 (by Oracle Corporation)
Launcher: 1.0.8 (bootstrap 4)
Minecraft: 1.6.1 (updated Tue Jul 02 12:27:58 CDT 2013)