Minecraft Forums

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 8/4/12 3:07 PM
Description: Unexpected error

java.lang.NullPointerException
at apm.b(SourceFile:141)
at apm.v_(SourceFile:137)
at asz.a(SourceFile:52)
at auv.b(SourceFile:706)
at net.minecraft.client.Minecraft.J(SourceFile:607)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

Relevant Details:
- Minecraft Version: 1.3.1
- 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: 476322856 bytes (454 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- LWJGL: 2.4.2
- OpenGL: GeForce GTX 675M/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)

I would try to Force-Update because there might be a glitch in your jar file.