[MC-2393] crash while disconnected from server

i don't know.. just minecraft crashed right after disconnected by closing server. i only have crash report. it is not modded.

오후=P.M.

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 12. 11. 6 오후 11:13
Description: Unexpected error

java.lang.NullPointerException
	at aud.b(SourceFile:256)
	at net.minecraft.client.Minecraft.a(SourceFile:433)
	at awr.a(SourceFile:484)
	at db.a(SourceFile:27)
	at bx.b(SourceFile:341)
	at awr.d(SourceFile:98)
	at awz.b(SourceFile:61)
	at net.minecraft.client.Minecraft.l(SourceFile:1282)
	at net.minecraft.client.Minecraft.J(SourceFile:582)
	at net.minecraft.client.Minecraft.run(SourceFile:534)
	at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_07, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 433535408 bytes (413 MB) / 510394368 bytes (486 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 897 (50232 bytes; 0 MB) allocated, 895 (50120 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: GeForce GTX 550 Ti/PCI/SSE2 GL version 4.1.0, NVIDIA Corporation
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null