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I've played Minecraft on the same computer for two years and now I keep getting this crash report. Any help is appreciated.

Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 442054128 bytes (421 MB) / 759758848 bytes (724 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 380541 (21310296 bytes; 20 MB) allocated, 380541 (21310296 bytes; 20 MB) used
- Is Modded: Probably not
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 15741 (881496 bytes; 0 MB) allocated, 15741 (881496 bytes; 0 MB) used
- Player Count: 0 / 8; []
- World Survive Entities: 0 total; []
- World Survive Players: 0 total; []
- World Survive Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Integrated Server

java.lang.NullPointerException
at bw.b(SourceFile:103)
at bw.a(SourceFile:35)
at im.b(SourceFile:457)
at ge.a(SourceFile:73)
at bce.b(SourceFile:72)
at net.minecraft.server.MinecraftServer.r(SourceFile:731)
at net.minecraft.server.MinecraftServer.q(SourceFile:661)
at bcb.q(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:595)
at fp.run(SourceFile:818)
--- END ERROR REPORT 9d43ce6 ----------