Minecraft 1.6.1 crashes when talking in multiplayer

So i got minecraft 1.6.1, and when i went onto a server, typing into global chat crashed the game. I could issue commands though.

Crash Report

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 2/07/13 6:00 PM
Description: Deserializing Message

java.lang.ClassCastException: com.google.gson.JsonPrimitive cannot be cast to com.google.gson.JsonObject
	at cw.a(SourceFile:14)
	at cw.deserialize(SourceFile:10)
	at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
	at com.google.gson.Gson.fromJson(Gson.java:795)
	at com.google.gson.Gson.fromJson(Gson.java:761)
	at com.google.gson.Gson.fromJson(Gson.java:710)
	at com.google.gson.Gson.fromJson(Gson.java:682)
	at cu.c(SourceFile:220)
	at bcn.a(SourceFile:518)
	at dl.a(SourceFile:49)
	at cn.b(SourceFile:350)
	at bcn.d(SourceFile:95)
	at bcu.b(SourceFile:60)
	at atn.k(SourceFile:1380)
	at atn.S(SourceFile:662)
	at atn.d(SourceFile:618)
	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 cw.a(SourceFile:14)
	at cw.deserialize(SourceFile:10)
	at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
	at com.google.gson.Gson.fromJson(Gson.java:795)
	at com.google.gson.Gson.fromJson(Gson.java:761)
	at com.google.gson.Gson.fromJson(Gson.java:710)
	at com.google.gson.Gson.fromJson(Gson.java:682)

-- Serialized Message --
Details:
	JSON string: Cannot send chat message.
Stacktrace:
	at cu.c(SourceFile:220)
	at bcn.a(SourceFile:518)
	at dl.a(SourceFile:49)
	at cn.b(SourceFile:350)
	at bcn.d(SourceFile:95)

-- Affected level --
Details:
	Level name: MpServer
	All players: 3 total; [bcx['TechnoCrafter'/75662, l='MpServer', x=-155.15, y=63.62, z=135.10], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-985,24,1505), Chunk: (at 7,1,1 in -62,94; contains blocks -992,0,1504 to -977,255,1519), Region: (-2,2; contains chunks -64,64 to -33,95, blocks -1024,0,1024 to -513,255,1535)
	Level time: 423220 game time, 633045 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: false. Cheats: false
	Forced entities: 9 total; [bcx['TechnoCrafter'/75662, l='MpServer', x=-155.15, y=63.62, z=135.10], ben['jardanian'/59830, l='MpServer', x=-270.16, y=85.09, z=176.31], ben['sader990'/60976, l='MpServer', x=-134.63, y=66.00, z=196.38], ben['Kailon71'/59405, l='MpServer', x=-122.31, y=65.31, z=195.03], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88], ben['EliteOpfer'/74861, l='MpServer', x=-125.88, y=62.88, z=154.38], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88]]
	Retry entities: 0 total; []
Stacktrace:
	at bcu.a(SourceFile:284)
	at atn.k(SourceFile:1387)
	at atn.S(SourceFile:662)
	at atn.d(SourceFile:618)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- Affected level --
Details:
	Level name: MpServer
	All players: 3 total; [bcx['TechnoCrafter'/75662, l='MpServer', x=-155.15, y=63.62, z=135.10], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-985,24,1505), Chunk: (at 7,1,1 in -62,94; contains blocks -992,0,1504 to -977,255,1519), Region: (-2,2; contains chunks -64,64 to -33,95, blocks -1024,0,1024 to -513,255,1535)
	Level time: 423220 game time, 633045 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: false. Cheats: false
	Forced entities: 9 total; [bcx['TechnoCrafter'/75662, l='MpServer', x=-155.15, y=63.62, z=135.10], ben['jardanian'/59830, l='MpServer', x=-270.16, y=85.09, z=176.31], ben['sader990'/60976, l='MpServer', x=-134.63, y=66.00, z=196.38], ben['Kailon71'/59405, l='MpServer', x=-122.31, y=65.31, z=195.03], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88], ben['EliteOpfer'/74861, l='MpServer', x=-125.88, y=62.88, z=154.38], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['xXD4ARK_KILL3RXx'/59235, l='MpServer', x=-125.41, y=62.00, z=153.66], ben['Regina_hml'/75858, l='MpServer', x=-117.31, y=62.00, z=150.88]]
	Retry entities: 0 total; []

-- System Details --
Details:
	Minecraft Version: 1.6.1
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 245702096 bytes (234 MB) / 416874496 bytes (397 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 72 (4032 bytes; 0 MB) allocated, 27 (1512 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.1
	LWJGL: 2.9.0
	OpenGL: GeForce GT 640M LE/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 353 (19768 bytes; 0 MB) allocated, 17 (952 bytes; 0 MB) used