---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 5/22/13 9:48 PM
Description: Updating screen events

java.lang.RuntimeException: Failed to check session lock, aborting
	at aki.h(SourceFile:44)
	at aki.<init>(SourceFile:30)
	at ake.<init>(SourceFile:16)
	at akf.a(SourceFile:83)
	at asm.a(SourceFile:1356)
	at atr.a(SourceFile:204)
	at auu.a(SourceFile:74)
	at atr.a(SourceFile:305)
	at auu.d(SourceFile:129)
	at auu.m(SourceFile:113)
	at asm.j(SourceFile:1086)
	at asm.O(SourceFile:588)
	at asm.c(SourceFile:544)
	at net.minecraft.client.main.Main.main(SourceFile:78)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at aki.h(SourceFile:44)
	at aki.<init>(SourceFile:30)
	at ake.<init>(SourceFile:16)
	at akf.a(SourceFile:83)
	at asm.a(SourceFile:1356)
	at atr.a(SourceFile:204)
	at auu.a(SourceFile:74)
	at atr.a(SourceFile:305)
	at auu.d(SourceFile:129)
	at auu.m(SourceFile:113)

-- Affected screen --
Details:
	Screen name: bhz
Stacktrace:
	at asm.j(SourceFile:1086)
	at asm.O(SourceFile:588)
	at asm.c(SourceFile:544)
	at net.minecraft.client.main.Main.main(SourceFile:78)

-- System Details --
Details:
	Minecraft Version: 13w19a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.6.0_27, Sun Microsystems Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
	Memory: 218329760 bytes (208 MB) / 252248064 bytes (240 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2455, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null