Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at bcw.a(SourceFile:654)
	at bcw.a(SourceFile:359)
	at fi.a(SourceFile:31)
	at cn.b(SourceFile:118)
	at cn.a(SourceFile:41)

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 9/19/13 8:57 PM
Description: Sending packet

java.lang.NullPointerException
	at bcw.a(SourceFile:654)
	at bcw.a(SourceFile:359)
	at fi.a(SourceFile:31)
	at cn.b(SourceFile:118)
	at cn.a(SourceFile:41)
	at ka.b(SourceFile:423)
	at jx.a(SourceFile:230)
	at jx.a(SourceFile:196)
	at jm.a(SourceFile:124)
	at net.minecraft.server.MinecraftServer.t(SourceFile:479)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)


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

-- Head --
Stacktrace:
	at bcw.a(SourceFile:654)
	at bcw.a(SourceFile:359)
	at fi.a(SourceFile:31)
	at cn.b(SourceFile:118)
	at cn.a(SourceFile:41)

-- Packet being sent --
Details:
	Packet ID: 35
	Packet class: fi
Stacktrace:
	at ka.b(SourceFile:423)
	at jx.a(SourceFile:230)
	at jx.a(SourceFile:196)
	at jm.a(SourceFile:124)
	at net.minecraft.server.MinecraftServer.t(SourceFile:479)
	at net.minecraft.server.MinecraftServer.s(SourceFile:406)
	at bkz.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:340)
	at hi.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	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: 421127304 bytes (401 MB) / 672792576 bytes (641 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 4086 (228816 bytes; 0 MB) allocated, 1457 (81592 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 3473 (194488 bytes; 0 MB) allocated, 1719 (96264 bytes; 0 MB) used
	Player Count: 1 / 8; [jv['ZeroG514'/1159485, l='...', x=-178.50, y=78.00, z=259.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.