Opening stats causes crash in sp or mp.

I hit "esc" and clicked "statistics" and i crashed. i dont understand this at all.
---CRASH REPORT---
Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to /Users/theboys/Library/Application Support/minecraft/crash-reports/crash-2013-04-18_18.44.10-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 😞

— BEGIN ERROR REPORT d6dca916 --------
Full report at:
/Users/theboys/Library/Application Support/minecraft/crash-reports/crash-2013-04-18_18.44.10-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 4/18/13 6:44 PM

– Head –
Stacktrace:
at axl.a(SourceFile:59)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)

– Affected screen –
Details:
Screen name: axl

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bdw['ThePikaSan'/927430, l='MpServer', x=1592.20, y=69.85, z=-854.99]]
Chunk stats: MultiplayerChunkCache: 49
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (7984,65,5259), Chunk: (at 0,4,11 in 499,328; contains blocks 7984,0,5248 to 7999,255,5263), Region: (15,10; contains chunks 480,320 to 511,351, blocks 7680,0,5120 to 8191,255,5631)
Level time: 206553374 game time, 37100646006 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: 20 total; [np['Painting'/932976, l='MpServer', x=1624.50, y=67.50, z=-902.94], np['Painting'/932960, l='MpServer', x=1646.94, y=66.50, z=-893.00], bfl['SwordSwarm'/929588, l='MpServer', x=1611.97, y=74.84, z=-857.34], np['Painting'/932961, l='MpServer', x=1646.94, y=66.50, z=-894.50], np['Painting'/933102, l='MpServer', x=1672.06, y=67.50, z=-867.50], np['Painting'/932944, l='MpServer', x=1622.00, y=67.50, z=-891.06], bfl['SwordSwarm'/929588, l='MpServer', x=1636.47, y=69.23, z=-896.44], bfl['SwordSwarm'/929588, l='MpServer', x=1630.64, y=65.00, z=-847.29], np['Painting'/932973, l='MpServer', x=1616.06, y=67.50, z=-900.00], np['Painting'/932972, l='MpServer', x=1615.06, y=67.50, z=-897.00], np['Painting'/933100, l='MpServer', x=1672.06, y=67.00, z=-869.00], np['Painting'/932944, l='MpServer', x=1622.00, y=67.50, z=-891.06], np['Painting'/932974, l='MpServer', x=1621.00, y=67.00, z=-902.94], bfl['SwordSwarm'/929588, l='MpServer', x=1612.03, y=75.31, z=-846.28], np['Painting'/933101, l='MpServer', x=1672.06, y=66.50, z=-867.50], bfl['SwordSwarm'/929588, l='MpServer', x=1637.63, y=72.59, z=-885.02], np['Painting'/932943, l='MpServer', x=1625.94, y=66.50, z=-894.50], np['Painting'/932975, l='MpServer', x=1616.00, y=66.50, z=-902.94], np['Painting'/932972, l='MpServer', x=1615.06, y=67.50, z=-897.00], bdw['ThePikaSan'/927430, l='MpServer', x=1592.20, y=69.85, z=-854.99]]
Retry entities: 0 total; []
Stacktrace:
at bdt.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Thread.java:613)

– System Details –
Details:
Minecraft Version: 1.5.1
Operating System: Mac OS X (ppc) version 10.4.11
Java Version: 1.5.0_19, Apple Computer, Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), "Apple Computer, Inc."
Memory: 27479592 bytes (26 MB) / 61079552 bytes (58 MB) up to 1061814272 bytes (1012 MB)
JVM Flags: 1 total; -Xmx1024m
AABB Pool Size: 132 (7392 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdaterSmooth, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: ATI Radeon X600 XT OpenGL Engine GL version 1.5 ATI-1.4.18, ATI Technologies Inc.
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 162 (9072 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used

java.lang.VerifyError: (class: aye, method: a signature: (Lawg;)V) Bad type in putfield/putstatic
at axl.a(SourceFile:59)
at axr.a(SourceFile:72)
at axr.d(SourceFile:127)
at axr.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1078)
at net.minecraft.client.Minecraft.K(SourceFile:574)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Thread.java:613)
— END ERROR REPORT 1084e0a4 ----------

Regards,
Pikachu