Crash due to corrupt pack.png in texture pack

Put the summary of the bug you're having here

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 5/10/13 4:30 PM
Description: Initializing game

java.lang.NullPointerException
	at bhl.g(SourceFile:49)
	at bhl.<init>(SourceFile:31)
	at bhn.<init>(SourceFile:13)
	at bhq.c(SourceFile:115)
	at bhq.<init>(SourceFile:37)
	at asm.L(SourceFile:260)
	at asm.c(SourceFile:524)
	at net.minecraft.client.main.Main.main(SourceFile:78)


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

-- Head --
Stacktrace:
	at bhl.g(SourceFile:49)
	at bhl.<init>(SourceFile:31)
	at bhn.<init>(SourceFile:13)
	at bhq.c(SourceFile:115)
	at bhq.<init>(SourceFile:37)
	at asm.L(SourceFile:260)

-- Initialization --
Details:
Stacktrace:
	at asm.c(SourceFile:524)
	at net.minecraft.client.main.Main.main(SourceFile:78)

-- System Details --
Details:
	Minecraft Version: 13w19a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 104466040 bytes (99 MB) / 128516096 bytes (122 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	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
	LWJGL: 2.9.0
	OpenGL: GeForce GT 320/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

What am I doing wrong if when I hit login I crash?