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My minecraft single player world keeps on crashing after lagging
This is the crash report:


---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 12/2/12 12:46 PM
Description: Ticking screen

java.lang.NullPointerException
at aym.c(SourceFile:28)
at net.minecraft.client.Minecraft.l(SourceFile:1112)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at aym.c(SourceFile:28)

-- Affected screen --
Details:
Screen name: aym
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1112)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.4.5
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: 542092416 bytes (516 MB) / 708116480 bytes (675 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdates, ...]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 8.15.10.2761, Intel
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: nullPlease help

Seems like a massive memory leak. If it runs out like that, then it more than likely is a memory leak.