HelpMinecraft keeps crashing

---- Minecraft Crash Report ----

Time: 31.12.13 19:16
Description: Unexpected error

java.lang.ArithmeticException: / by zero
at bmm.b(SourceFile:814)
at azi.ah(SourceFile:787)
at azi.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:152 )


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

-- Head --
Stacktrace:
at bka.a(SourceFile:289)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bkf['Orinion77'/352, l='MpServer', x=268,10, y=70,62, z=-95,77]]
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (106,64,-43), Chunk: (at 10,4,5 in 6,-3; contains blocks 96,0,-48 to 111,255,-33), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 1724 game time, 1724 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: survival (ID 0). Hardcore: true. Cheats: false
Forced entities: 1 total; [bkf['Orinion77'/352, l='MpServer', x=268,10, y=70,62, z=-95,77]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bka.a(SourceFile:289)
at azi.b(SourceFile:1952)
at azi.f(SourceFile:725)
at net.minecraft.client.main.Main.main(SourceFile:152 )

-- System Details --
Details:
Minecraft Version: 1.7.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2024282168 bytes (1930 MB) / 2112618496 bytes (2014 MB) up to 4260102144 bytes (4062 MB)
JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerform ance_javaw.exe_minecraft.exe.heapdump -Xmx3G -Xincgc -Xms2048m -Xmx4096m
AABB Pool Size: 4625 (259000 bytes; 0 MB) allocated, 4625 (259000 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: GeForce GTX 460/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: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)