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When I open minecraft everything runs fine till I try and open a world, it may open for a moment, but then it says shutting down internal server and closes. Heres the crash report but it doesn't appear every time:

---- Minecraft Crash Report ----
// You're mean.
Time: 10/12/13 4:14 PM
Description: Exception in world tick
java.lang.NullPointerException
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:952)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.WorldClient.func_72835_b(WorldClient.java:99)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1928)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at net.minecraft.client.multiplayer.NetClientHandler.func_72519_a(NetClientHandler.java:952)
at net.minecraft.network.packet.Packet24MobSpawn.func_73279_a(SourceFile:87)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Ripper882'/242, l='MpServer', x=173.36, y=87.62, z=380.36]]
Chunk stats: MultiplayerChunkCache: 10
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (220,64,248), Chunk: (at 12,4,8 in 13,15; contains blocks 208,0,240 to 223,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 180355 game time, 217681 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: 5 total; [EntityBat['Bat'/50, l='MpServer', x=144.75, y=59.00, z=363.03], EntityClientPlayerMP['Ripper882'/242, l='MpServer', x=173.36, y=87.62, z=380.36], EntityWolf['Wolf'/53, l='MpServer', x=174.69, y=86.00, z=380.91], EntityWolf['Wolf'/52, l='MpServer', x=169.44, y=86.00, z=378.97], EntityWolf['Wolf'/58, l='MpServer', x=177.06, y=86.00, z=381.84]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1941)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:908)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)
-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Ripper882'/242, l='MpServer', x=173.36, y=87.62, z=380.36]]
Chunk stats: MultiplayerChunkCache: 10
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (220,64,248), Chunk: (at 12,4,8 in 13,15; contains blocks 208,0,240 to 223,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 180355 game time, 217681 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: 5 total; [EntityBat['Bat'/50, l='MpServer', x=144.75, y=59.00, z=363.03], EntityClientPlayerMP['Ripper882'/242, l='MpServer', x=173.36, y=87.62, z=380.36], EntityWolf['Wolf'/53, l='MpServer', x=174.69, y=86.00, z=380.91], EntityWolf['Wolf'/52, l='MpServer', x=169.44, y=86.00, z=378.97], EntityWolf['Wolf'/58, l='MpServer', x=177.06, y=86.00, z=381.84]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 161100016 bytes (153 MB) / 296419328 bytes (282 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 7955 (445480 bytes; 0 MB) allocated, 49 (2744 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 29, allocated: 3, tallocated: 63
FML: MCP v8.11 FML v6.4.3.883 Minecraft Forge 9.11.0.883 32 mods loaded, 32 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.3.883} [Forge Mod Loader] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.0.883} [Minecraft Forge] (minecraftforge-9.11.0.883.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsAPI{1.6.4} [Familiars API] (Familiars_API_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.9.0.9} [Damage Indicators] (1.6.4 DamageIndicators v2.9.0.9.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
monsterhunter{Alpha Development 0.3 } [MonsterHunterFrontier] ([AlphaD]MHF_Craft-164[0.0.4.3].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AnimationAPI{1.1.1} [AnimationAPI] (AnimationAPI v1.1.2 mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BC2{1.0.0} [Bosscraft 2] (Bosscraft2 (1.0.2).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BWG4{1.1.9} [Better World Generation 4] (BWG4_V119.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CyanSwords{1.9.0} [Cyan Warrior Swords] (Cyan_Warrior_Swords_Mod_v.1.9.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsDefaultMobPack{1.6.4} [Familiars DefaultMobPack] (Familiars_DefaultMobPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsExtendedFamPack{1.6.4} [Familiars ExtendedFamPack] (Familiars_ExtendedFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FamiliarsHerobrineFamPack{1.6.4} [Familiars HerobrineFamPack] (Familiars_HerobrineFamPack_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SpawnEggs{1.6.4.0} [Better Spawn Eggs] (Forge_BetterSpawnEggsv1.6.4.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GraveStone{2.4.1} [GraveStone] (GraveStone_2.4.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LavaMonsters{2.2} [Lava Monsters] (LavaMonsters 2.2 for MC 1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LycanitesMobs{0.2.5 - MC 1.6.4} [Lycanites Mobs] (LycanitesMobsComplete 0.2.5 [1.6.4].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DemonMobs{0.2.5 - MC 1.6.4} [Demon Mobs] (LycanitesMobsComplete 0.2.5 [1.6.4].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DesertMobs{0.2.5 - MC 1.6.4} [Desert Mobs] (LycanitesMobsComplete 0.2.5 [1.6.4].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SwampMobs{0.2.5 - MC 1.6.4} [Swamp Mobs] (LycanitesMobsComplete 0.2.5 [1.6.4].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
meteors{2.11.2} [Falling Meteors] (Meteors Mod V2.11.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
chimera27metroid{1.0.0} [Metroid Cubed] (Metroid Cubed 1.3.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MutantCreatures{1.4.4} [Mutant Creatures] (Mutant_Creatures_v1.4.4_mc1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OreSpawn{164.8} [OreSpawn] (OreSpawn164v8.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
rancraftpenguins{1.6.4o} [Rancraft Penguins] (RancraftPengForge_v164o.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
rwbyCraft{1.6.2} [RWBY Craft By KelcoK22] (RWBY_C.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_Unlimited{2.3} [mod_Unlimited] (Superheroes Unlimited Mod V2.3.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SwordArtOnline{1.5.1} [Sword Art Online] (UCKs_SwordArtOnlineMod_v1.5.1_beta.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
vulcansrevenge{v5} [Vulcan's Revenge] (Vulcans Revenge Beta Test v4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
WeepingAngelsMod{?} [Weeping Angels Mod] (WeepingAngels alpha2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_thKaguya{2.43_1.6.4} [Itutu no Nandai MOD+] (?????MOD+ ver2.44_1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.6.4-Forge9.11.0.883
LWJGL: 2.9.0
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 9.17.10.2817, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 138 (7728 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used

I have the same error