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hey does anyone know how to fix this crash?? only mods i am using are magic launcher and optifine. the game won't even load the save and crashes after 5 mins of attepting to load world.

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

Time: 3/8/13 6:18 PM
Description: Exception in server tick loop

java.lang.NullPointerException
at cf.b(SourceFile:103)
at cf.a(SourceFile:35)
at iv.b(SourceFile:436)
at gm.a(SourceFile:72)
at bec.b(SourceFile:73)
at net.minecraft.server.MinecraftServer.r(SourceFile:762)
at net.minecraft.server.MinecraftServer.q(SourceFile:679)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(SourceFile:613)
at fy.run(SourceFile:849)


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

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 121867312 bytes (116 MB) / 477233152 bytes (455 MB) up to 477233152 bytes (455 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 192998 (10807888 bytes; 10 MB) allocated, 192998 (10807888 bytes; 10 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdaterThreaded, ...]
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 21757 (1218392 bytes; 1 MB) allocated, 21757 (1218392 bytes; 1 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Very likely; Jar signature invalidated

Did this start happening all of a sudden, or after you installed a new mod or something? You might want to consider contacting Mojang's Online Help Desk, a link to that website can be found here ----> http://www.minecraft.net

this happened out of the blue. i didn't touch anything. and all of a sudden it stopped working.

Double check to make sure your Java is up to date, and check to make sure nothing went wrong with, say, a video card driver in your computer. Other than that, I can't really see a reason as to why a crash would just randomly occur, and not only that, but keep on happening repeatably.