Hopper: java.lang.ArithmeticException: / by zero

java.lang.ArithmeticException: / by zero
	at awg.a(SourceFile:312)
	at awh.a(SourceFile:183)

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 13/09/21 18:25
Description: Rendering screen

java.lang.ArithmeticException: / by zero
	at awg.a(SourceFile:312)
	at awh.a(SourceFile:183)
	at bfe.b(SourceFile:718)
	at atv.S(SourceFile:686)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at awg.a(SourceFile:312)
	at awh.a(SourceFile:183)

-- Screen render details --
Details:
	Screen name: awh
	Mouse location: Scaled: (84, 1). Absolute: (84, -1)
	Screen size: Scaled: (854, 1). Absolute: (854, 1). Scale factor of 1
Stacktrace:
	at bfe.b(SourceFile:718)
	at atv.S(SourceFile:686)
	at atv.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 36980384 bytes (35 MB) / 69648384 bytes (66 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.2867, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: 日本語 (日本)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null