Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap$Segment.rehash(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap$Segment.put(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source)
	at java.lang.ClassLoader.getClassLoadingLock(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at bhm.<init>(SourceFile:42)
	at avx.Q(SourceFile:351)

---- Minecraft Crash Report ----
// Why did you do that?

Time: 9/5/13 10:06 PM
Description: Initializing game

java.lang.NullPointerException
	at java.util.concurrent.ConcurrentHashMap$Segment.rehash(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap$Segment.put(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source)
	at java.lang.ClassLoader.getClassLoadingLock(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at bhm.<init>(SourceFile:42)
	at avx.Q(SourceFile:351)
	at avx.e(SourceFile:622)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at java.util.concurrent.ConcurrentHashMap$Segment.rehash(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap$Segment.put(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap.putIfAbsent(Unknown Source)
	at java.lang.ClassLoader.getClassLoadingLock(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at bhm.<init>(SourceFile:42)
	at avx.Q(SourceFile:351)

-- Initialization --
Details:
Stacktrace:
	at avx.e(SourceFile:622)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 96974536 bytes (92 MB) / 160301056 bytes (152 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.text.ArabicShapingException], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w36a
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7900 Series GL version 4.2.12217 Compatibility Profile Context 12.104.0.0, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null