Crash

---- Minecraft Crash Report ----
// Would you like a cupcake?

Time: 3/1/14 3:08 AM
Description: Ticking memory connection

java.lang.NullPointerException
	at thaumcraft.common.items.wands.WandManager.changeFocus(WandManager.java:412)
	at thaumcraft.common.lib.PacketHandler.handleFocusChangePacket(PacketHandler.java:1189)
	at thaumcraft.common.lib.PacketHandler.onPacketData(PacketHandler.java:178)
	at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
	at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
	at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:85)
	at net.minecraft.network.NetServerHandler.func_72501_a(NetServerHandler.java:1130)
	at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
	at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
	at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
	at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
	at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at thaumcraft.common.items.wands.WandManager.changeFocus(WandManager.java:412)
	at thaumcraft.common.lib.PacketHandler.handleFocusChangePacket(PacketHandler.java:1189)
	at thaumcraft.common.lib.PacketHandler.onPacketData(PacketHandler.java:178)
	at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:255)
	at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:245)
	at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:85)
	at net.minecraft.network.NetServerHandler.func_72501_a(NetServerHandler.java:1130)
	at net.minecraft.network.packet.Packet250CustomPayload.func_73279_a(SourceFile:61)
	at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
	at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)

-- Ticking connection --
Details:
	Connection: net.minecraft.network.NetServerHandler@16001e9c
Stacktrace:
	at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
	at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 303469248 bytes (289 MB) / 628621312 bytes (599 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 4546 (254576 bytes; 0 MB) allocated, 4200 (235200 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	FML: MCP v8.11 FML v6.4.45.953 Minecraft Forge 9.11.1.953 8 mods loaded, 8 mods active
	mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	FML{6.4.45.953} [Forge Mod Loader] (minecraftforge-9.11.1.953.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Forge{9.11.1.953} [Minecraft Forge] (minecraftforge-9.11.1.953.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	arsmagica2{1.1.2b} [Ars Magica 2] (AM2_1.1.2b.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	SKC-Core{1.0.1.0} [SKC Core] (SKC Core 1.0.1.0 - MC 1.6.4 - Forge (9.11.0.880).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	SKC-CraftableHorseArmor{1.0.3.0} [Craftable Horse Armor] (CraftableHorseArmor 1.0.3.0 - MC 1.6.4 - Forge (9.10.0.880)(2).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Thaumcraft{4.1.0} [Thaumcraft] (Thaumcraft4.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1215 (68040 bytes; 0 MB) allocated, 851 (47656 bytes; 0 MB) used
	Player Count: 1 / 8; [EntityPlayerMP['Vinven'/239, l='Magic 1.6.4', x=-858.65, y=69.00, z=299.65]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'