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Please help what do we need to do?

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 6/13/13 9:34 AM
Description: Sending packet

java.lang.NullPointerException
at ch.b(SourceFile:107)
at ch.a(SourceFile:39)
at jh.b(SourceFile:430)
at gu.b(SourceFile:669)
at gu.a(SourceFile:79)
at bjj.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:480)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)


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

--
Head --
Stacktrace:

at ch.b(SourceFile:107)

at ch.a(SourceFile:39)

-- Packet being sent --
Details:
Packet ID: 4
Packet class: fh
Stacktrace:

at jh.b(SourceFile:430)

at gu.b(SourceFile:669)

at gu.a(SourceFile:79)

at bjj.b(SourceFile:73)

at net.minecraft.server.MinecraftServer.r(SourceFile:480)

at net.minecraft.server.MinecraftServer.q(SourceFile:397)

at bjg.q(SourceFile:122)

at net.minecraft.server.MinecraftServer.run(SourceFile:331)

at gp.run(SourceFile:573)


-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_18-ea, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 245532416 bytes (234 MB) / 542965760 bytes (517 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 86170 (4825520 bytes; 4 MB) allocated, 86170 (4825520 bytes; 4 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 309335 (17322760 bytes; 16 MB) allocated, 309335 (17322760 bytes; 16 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.