Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at uw.o_(SourceFile:204)

---- Minecraft Crash Report ----
// You're mean.

Time: 07/09/13 00:13
Description: Ticking player

java.lang.ArrayIndexOutOfBoundsException: 40
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at uw.o_(SourceFile:204)
	at kg.h(SourceFile:192)
	at kl.a(SourceFile:195)
	at fd.a(SourceFile:136)
	at cv.b(SourceFile:64)
	at kl.e(SourceFile:63)
	at ko.b(SourceFile:37)
	at bnq.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)


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

-- Head --
Stacktrace:
	at ny.a(SourceFile:89)
	at ou.aL(SourceFile:396)
	at ou.z(SourceFile:222)
	at oc.o_(SourceFile:279)
	at ou.o_(SourceFile:1167)
	at uw.o_(SourceFile:204)

-- Player being ticked --
Details:
	Entity Type: null (kg)
	Entity ID: 0
	Entity Name: minihilly
	Entity's Exact location: -1212.50, 56.00, -1170.50
	Entity's Block location: World: (-1213,56,-1171), Chunk: (at 3,3,13 in -76,-74; contains blocks -1216,0,-1184 to -1201,255,-1169), Region: (-3,-3; contains chunks -96,-96 to -65,-65, blocks -1536,0,-1536 to -1025,255,-1025)
	Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
	at kg.h(SourceFile:192)
	at kl.a(SourceFile:195)
	at fd.a(SourceFile:136)
	at cv.b(SourceFile:64)
	at kl.e(SourceFile:63)

-- Ticking connection --
Details:
	Connection: kl@59dd7c4b
Stacktrace:
	at ko.b(SourceFile:37)
	at bnq.b(SourceFile:84)
	at net.minecraft.server.MinecraftServer.t(SourceFile:481)
	at net.minecraft.server.MinecraftServer.s(SourceFile:398)
	at bnn.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:332)
	at hr.run(SourceFile:575)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 399293384 bytes (380 MB) / 555876352 bytes (530 MB) up to 1908932608 bytes (1820 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
	AABB Pool Size: 3 (168 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1 (56 bytes; 0 MB) allocated, 1 (56 bytes; 0 MB) used
	Player Count: 1 / 8; [kg['minihilly'/0, l='Ultimate 1.7 Redstoning', x=-1212.50, y=56.00, z=-1170.50]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.