Crash beim einloggen

2015-01-19 16:31:48 [INFO] fcgbzg[/92.213.30.11:49756] logged in with
entity id 351 at (-64.53257155653546, 59.45901755134254,
123.08781990173425)
2015-01-19 16:31:49 [INFO] Usage: /say
2015-01-19 16:31:52 [SEVERE] Encountered an unexpected exception ReportedException
net.minecraft.util.ReportedException: Ticking entity
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:660)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:275)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:573)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:470)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.NullPointerException
at net.minecraft.item.ItemStack.func_77972_a(ItemStack.java:357)
at nmccoy.legendgear.entities.EntityMagicBoomerang.func_70184_a(EntityMagicBoomerang.java:120)
at net.minecraft.entity.projectile.EntityThrowable.func_70071_h_(SourceFile:190)
at nmccoy.legendgear.entities.EntityMagicBoomerang.func_70071_h_(EntityMagicBoomerang.java:277)
at net.minecraft.world.World.func_72866_a(World.java:2342)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
at net.minecraft.world.World.func_72870_g(World.java:2304)
at net.minecraft.world.World.func_72939_s(World.java:2150)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:654)
... 4 more