10-20 18:10:06 [SEVERE] [ForgeModLoader] A critical server error occured handling a packet, kicking 30404
java.lang.NullPointerException
        at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:514)
        at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:896)
        at net.minecraft.network.packet.Packet15Place.func_73279_a(Packet15Place.java:79)
        at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:355)
        at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:233)
        at net.minecraft.network.NetworkListenThread.func_71747_b_net_minecraft_network_NetworkListenThread_networkTick_p0(NetworkListenThread.java:37)
        at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java)
        at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:34)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:396)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:275)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:164)
        at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)
10-20 18:10:06 [WARNING] [Minecraft] Failed to handle packet for Zuname/212.3.142.172: java.lang.NullPointerException
java.lang.NullPointerException
        at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:514)
        at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:896)
        at net.minecraft.network.packet.Packet15Place.func_73279_a(Packet15Place.java:79)
        at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:355)
        at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:233)
        at net.minecraft.network.NetworkListenThread.func_71747_b_net_minecraft_network_NetworkListenThread_networkTick_p0(NetworkListenThread.java:37)
        at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java)
        at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(DedicatedServerListenThread.java:34)
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:396)
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:275)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:164)
        at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)