My minecraft window keeps crashing and closing when I play online. I don't know yet if it affects my non-online game but I'll comment if it does. Here's my report.

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

Time: 7/10/13 12:40 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 bct.a(SourceFile:522)
at dl.a(SourceFile:49)
at cn.b(SourceFile:354)
at bct.e(SourceFile:98)
at bda.b(SourceFile:60)
at ats.k(SourceFile:1386)
at ats.S(SourceFile:663)
at ats.d(SourceFile:619)
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 bct.a(SourceFile:522)
at dl.a(SourceFile:49)
at cn.b(SourceFile:354)
at bct.e(SourceFile:98)

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [bdf['Avia_Podrocks'/4266863, l='MpServer', x=-8.04, y=147.62, z=4.54], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,146,6), Chunk: (at 0,9,6 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 61462458 game time, 72640945201 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: 14 total; [oc['entity.ItemFrame.name'/0, l='MpServer', x=-0.50, y=150.50, z=-4.94], oc['entity.ItemFrame.name'/1, l='MpServer', x=-10.94, y=150.50, z=7.50], oc['entity.ItemFrame.name'/2, l='MpServer', x=-10.94, y=150.50, z=5.50], oc['entity.ItemFrame.name'/3, l='MpServer', x=-0.50, y=150.50, z=17.94], oc['entity.ItemFrame.name'/4, l='MpServer', x=1.50, y=150.50, z=-4.94], oc['entity.ItemFrame.name'/5, l='MpServer', x=7.50, y=147.50, z=-1.94], bdf['Avia_Podrocks'/4266863, l='MpServer', x=-8.04, y=147.62, z=4.54], oc['entity.ItemFrame.name'/6, l='MpServer', x=9.50, y=149.50, z=15.94], bev['kitto_roren'/4264058, l='MpServer', x=-8.50, y=146.00, z=7.06], oc['entity.ItemFrame.name'/7, l='MpServer', x=7.50, y=149.50, z=15.94], oc['entity.ItemFrame.name'/8, l='MpServer', x=1.50, y=150.50, z=17.94], bev['leanrub'/3837797, l='MpServer', x=1.03, y=146.00, z=17.03], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server
Stacktrace:
at bda.a(SourceFile:284)
at ats.k(SourceFile:1393)
at ats.S(SourceFile:663)
at ats.d(SourceFile:619)
at net.minecraft.client.main.Main.main(SourceFile:101)

– Affected level –
Details:
Level name: MpServer
All players: 2 total; [bdf['Avia_Podrocks'/4266863, l='MpServer', x=-8.04, y=147.62, z=4.54], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56]]
Chunk stats: MultiplayerChunkCache: 121
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,146,6), Chunk: (at 0,9,6 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 61462458 game time, 72640945201 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: 14 total; [oc['entity.ItemFrame.name'/0, l='MpServer', x=-0.50, y=150.50, z=-4.94], oc['entity.ItemFrame.name'/1, l='MpServer', x=-10.94, y=150.50, z=7.50], oc['entity.ItemFrame.name'/2, l='MpServer', x=-10.94, y=150.50, z=5.50], oc['entity.ItemFrame.name'/3, l='MpServer', x=-0.50, y=150.50, z=17.94], oc['entity.ItemFrame.name'/4, l='MpServer', x=1.50, y=150.50, z=-4.94], oc['entity.ItemFrame.name'/5, l='MpServer', x=7.50, y=147.50, z=-1.94], bdf['Avia_Podrocks'/4266863, l='MpServer', x=-8.04, y=147.62, z=4.54], oc['entity.ItemFrame.name'/6, l='MpServer', x=9.50, y=149.50, z=15.94], bev['kitto_roren'/4264058, l='MpServer', x=-8.50, y=146.00, z=7.06], oc['entity.ItemFrame.name'/7, l='MpServer', x=7.50, y=149.50, z=15.94], oc['entity.ItemFrame.name'/8, l='MpServer', x=1.50, y=150.50, z=17.94], bev['leanrub'/3837797, l='MpServer', x=1.03, y=146.00, z=17.03], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56], bev['leanrub'/3837797, l='MpServer', x=3.94, y=146.00, z=15.56]]
Retry entities: 0 total; []
Server brand: craftbukkit
Server type: Non-integrated multiplayer server

– System Details –
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_17, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 108884760 bytes (103 MB) / 196476928 bytes (187 MB) up to 954466304 bytes (910 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 95 (5320 bytes; 0 MB) allocated, 18 (1008 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Launched Version: 1.6.2
LWJGL: 2.9.0
OpenGL: ATI Mobility Radeon HD 4250 GL version 3.2.9752 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 112 (6272 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used