Miért csinálja ezt a minecraft szerverem?

Hogyha egy táblára elkezdek írni néhány betű után ezt írja ki:

Minecraft has crashed!

----------------------

Minecraft has stopped running because it encountered a problem; Unexpected error

This error has been saved to C:\Documents and Settings\Felhasználó\Application Data\.minecraft\crash-reports\crash-2002-04-08_18.01.08-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

--- BEGIN ERROR REPORT 60633db5 --------

Generated 2002.04.08. 18:01

- Minecraft Version: 1.3.2

- Operating System: Windows XP (x86) version 5.1

- Java Version: 1.7.0_05, Oracle Corporation

- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation

- Memory: 444537608 bytes (423 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)

- JVM Flags: 2 total; -Xms512m -Xmx1024m

- LWJGL: 2.4.2

- OpenGL: GeForce FX 5200/AGP/SSE/3DNOW! GL version 2.0.3, NVIDIA Corporation

- Is Modded: Probably not

- Type: Client

- Texture Pack: Default

- Profiler Position: N/A (disabled)

java.lang.NullPointerException

at aqx.b(SourceFile:42)

at net.minecraft.client.Minecraft.a(SourceFile:434)

at asv.a(SourceFile:465)

at bb.b(SourceFile:339)

at asv.d(SourceFile:81)

at atd.b(SourceFile:51)

at net.minecraft.client.Minecraft.l(SourceFile:1261)

at net.minecraft.client.Minecraft.J(SourceFile:583)

at net.minecraft.client.Minecraft.run(SourceFile:535)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 6ad3a930 ----------