Error at joining

2013-11-17 00:16:28 [INFO] Honky89[/84.46.57.81:51152] logged in with entity id 373948 at ([Mystic-World] 2223.2884823656427, 27.0, -119.06862322416875)
2013-11-17 00:16:28 [WARNING] Failed to handle packet for Honky89/84.46.57.81: net.minecraft.server.v1_6_R3.ReportedException: Ticking player
net.minecraft.server.v1_6_R3.ReportedException: Ticking player
	at net.minecraft.server.v1_6_R3.EntityPlayer.h(EntityPlayer.java:282)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:343)
	at net.minecraft.server.v1_6_R3.Packet10Flying.handle(SourceFile:136)
	at net.minecraft.server.v1_6_R3.NetworkManager.b(NetworkManager.java:296)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at net.minecraft.server.v1_6_R3.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:592)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:227)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:488)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:421)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NullPointerException
	at net.minecraft.server.v1_6_R3.MobEffect.tick(SourceFile:89)
	at net.minecraft.server.v1_6_R3.EntityLiving.aJ(EntityLiving.java:424)
	at net.minecraft.server.v1_6_R3.EntityLiving.y(EntityLiving.java:219)
	at net.minecraft.server.v1_6_R3.Entity.l_(Entity.java:230)
	at net.minecraft.server.v1_6_R3.EntityLiving.l_(EntityLiving.java:1243)
	at net.minecraft.server.v1_6_R3.EntityHuman.l_(EntityHuman.java:157)
	at net.minecraft.server.v1_6_R3.EntityPlayer.h(EntityPlayer.java:228)
	... 11 more