Game closes when I try to talk

I attempt to talk and the game crashes

What I expected to happen was...:
I try to talk
What actually happened was...:
The game crashes

Steps to Reproduce:
1. Log in
2. type in something
3. game crashes

Error Log:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 7/8/13 9:48 AM
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: 1 total; [bcx['McDillard2'/7568293, l='MpServer', x=98.55, y=64.62, z=525.12]]
	Chunk stats: MultiplayerChunkCache: 81
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (96,78,296), Chunk: (at 0,4,8 in 6,18; contains blocks 96,0,288 to 111,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 491164519 game time, 491484679 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: 6 total; [uc['arrow'/7566883, l='MpServer', x=146.88, y=42.03, z=501.56], bcx['McDillard2'/7568293, l='MpServer', x=98.55, y=64.62, z=525.12], uc['arrow'/7566949, l='MpServer', x=146.06, y=39.41, z=496.47], sn['Boat'/7568295, l='MpServer', x=108.25, y=63.53, z=563.75], sn['Boat'/7567281, l='MpServer', x=101.72, y=63.28, z=522.69], sn['Boat'/7568297, l='MpServer', x=113.75, y=63.38, z=565.25]]
	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: 1 total; [bcx['McDillard2'/7568293, l='MpServer', x=98.55, y=64.62, z=525.12]]
	Chunk stats: MultiplayerChunkCache: 81
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (96,78,296), Chunk: (at 0,4,8 in 6,18; contains blocks 96,0,288 to 111,255,303), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 491164522 game time, 491484682 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: 6 total; [uc['arrow'/7566883, l='MpServer', x=146.88, y=42.03, z=501.56], bcx['McDillard2'/7568293, l='MpServer', x=98.55, y=64.62, z=525.12], uc['arrow'/7566949, l='MpServer', x=146.06, y=39.41, z=496.47], sn['Boat'/7568295, l='MpServer', x=108.25, y=63.53, z=563.75], sn['Boat'/7567281, l='MpServer', x=101.72, y=63.28, z=522.69], sn['Boat'/7568297, l='MpServer', x=113.75, y=63.38, z=565.25]]
	Retry entities: 0 total; []

-- System Details --
Details:
	Minecraft Version: 1.6.1
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 96708376 bytes (92 MB) / 222756864 bytes (212 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 17819 (997864 bytes; 0 MB) allocated, 49 (2744 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 GTX 660/PCIe/SSE2 GL version 4.3.0, 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: 2542 (142352 bytes; 0 MB) allocated, 33 (1848 bytes; 0 MB) used