---- Minecraft Crash Report ----
// There are four lights!

Time: 09.04.14 01:54
Description: Updating screen events

java.lang.NullPointerException: Updating screen events
at ace.d(SourceFile:221)
at aca.a(SourceFile:336)
at zu.b(SourceFile:41)
at zu.a(SourceFile:58)
at yp.a(SourceFile:238)
at bkf.a(SourceFile:308)
at bdq.a(SourceFile:490)
at bdq.a(SourceFile:318)
at bco.d(SourceFile:232)
at bco.k(SourceFile:211)
at azl.p(SourceFile:1303)
at azl.ah(SourceFile:757)
at azl.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

– Head –
Stacktrace:
at ace.d(SourceFile:221)
at aca.a(SourceFile:336)
at zu.b(SourceFile:41)
at zu.a(SourceFile:58)
at yp.a(SourceFile:238)
at bkf.a(SourceFile:308)
at bdq.a(SourceFile:490)
at bdq.a(SourceFile:318)
at bco.d(SourceFile:232)
at bco.k(SourceFile:211)

– Affected screen –
Details:
Screen name: bec

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [bkl['Dragon247'/32329, l='MpServer', x=824,61, y=139,62, z=-2596,93], bmk['Spitzkopf2312'/505, l='MpServer', x=823,64, y=139,28, z=-2598,74]]
Chunk stats: MultiplayerChunkCache: 961, 961
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,50,0), Chunk: (at 0,3,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 6443217 game time, 3000 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 8 total; [bkl['Dragon247'/32329, l='MpServer', x=824,61, y=139,62, z=-2596,93], bmk['Spitzkopf2312'/505, l='MpServer', x=823,64, y=139,28, z=-2598,74], bmk['Spitzkopf2312'/505, l='MpServer', x=823,64, y=139,28, z=-2598,74], wj['entity.MinecartChest.name'/31850, l='MpServer', x=813,50, y=41,50, z=-2664,13], wj['entity.MinecartChest.name'/31853, l='MpServer', x=841,50, y=28,50, z=-2672,50], ve['Kuh'/31845, l='MpServer', x=771,96, y=136,00, z=-2667,00], wj['entity.MinecartChest.name'/31844, l='MpServer', x=840,50, y=18,50, z=-2615,50], wj['entity.MinecartChest.name'/31846, l='MpServer', x=825,50, y=23,50, z=-2636,50]]
Retry entities: 0 total; []
Server brand: CraftBukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bkg.a(SourceFile:289)
at azl.b(SourceFile:1947)
at azl.f(SourceFile:720)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.5
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 370497336 bytes (353 MB) / 522977280 bytes (498 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.5
LWJGL: 2.9.1
OpenGL: GeForce GTX 570/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: Deutsch (Deutschland)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)