Hopper: java.lang.ArithmeticException: / by zero

java.lang.ArithmeticException: / by zero
	at bpj.a(SourceFile:95)
	at bpf.d(SourceFile:238)
	at bpe.b(SourceFile:163)
	at bpe.a(SourceFile:89)

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 10/10/13 11:17 AM
Description: Registering texture

java.lang.ArithmeticException: / by zero
	at bpj.a(SourceFile:95)
	at bpf.d(SourceFile:238)
	at bpe.b(SourceFile:163)
	at bpe.a(SourceFile:89)
	at bpg.a(SourceFile:72)
	at bpg.a(SourceFile:61)
	at bpg.a(SourceFile:52)
	at ays.X(SourceFile:457)
	at ays.e(SourceFile:691)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at bpj.a(SourceFile:95)
	at bpf.d(SourceFile:238)
	at bpe.b(SourceFile:163)
	at bpe.a(SourceFile:89)

-- Resource location being registered --
Details:
	Resource location: minecraft:textures/atlas/blocks.png
	Texture object class: bpe
Stacktrace:
	at bpg.a(SourceFile:72)
	at bpg.a(SourceFile:61)
	at bpg.a(SourceFile:52)
	at ays.X(SourceFile:457)

-- Initialization --
Details:
Stacktrace:
	at ays.e(SourceFile:691)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41a
	Operating System: Mac OS X (x86_64) version 10.8.5
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 38799096 bytes (37 MB) / 85000192 bytes (81 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 1 total; -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: 13w41a
	LWJGL: 2.9.0
	OpenGL: NVIDIA GeForce GT 650M OpenGL Engine GL version 2.1 NVIDIA-8.16.74 310.40.00.10f02, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [BCPack]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null