java.lang.NullPointerException
	at net.minecraft.src.NetClientHandler.handleMobSpawn(NetClientHandler.java:743)
	at net.minecraft.src.Packet24MobSpawn.processPacket(Packet24MobSpawn.java:137)
	at net.minecraft.src.MemoryConnection.processReadPackets(MemoryConnection.java:70)
	at net.minecraft.src.NetClientHandler.processReadPackets(NetClientHandler.java:90)
	at net.minecraft.src.WorldClient.tick(WorldClient.java:63)
	at net.minecraft.client.Minecraft.runTick(Minecraft.java:1760)
	at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:821)
	at net.minecraft.client.Minecraft.run(Minecraft.java:751)
	at java.lang.Thread.run(Thread.java:722)