[Server thread/WARN]: Failed to handle packet for /127.0.0.1:49863
net.minecraft.util.ReportedException: Ticking player
        at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:349) ~[mw.class:?]
        at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:303) ~[nh.class:?]
        at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137) ~[jd.class:?]
        at net.minecraft.network.play.client.C03PacketPlayer$C04PacketPlayerPosition.func_148833_a(SourceFile:63) ~[je.class:?]
        at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212) ~[ej.class:?]
        at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165) [nc.class:?]
        at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659) [MinecraftServer.class:?]
        at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:335) [lt.class:?]
        at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) [li.class:?]
Caused by: java.lang.NullPointerException
        at Reika.RotaryCraft.Items.Tools.ItemJetPack.use(ItemJetPack.java:63) ~[ItemJetPack.class:?]
        at Reika.RotaryCraft.Items.Tools.ItemJetPack.useJetpack(ItemJetPack.java:152) ~[ItemJetPack.class:?]
        at Reika.RotaryCraft.Items.Tools.ItemJetPack.onArmorTick(ItemJetPack.java:127) ~[ItemJetPack.class:?]
        at net.minecraft.entity.player.InventoryPlayer.func_70429_k(InventoryPlayer.java:319) ~[yx.class:?]
        at net.minecraft.entity.player.EntityPlayer.func_70636_d(EntityPlayer.java:538) ~[yz.class:?]
        at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1609) ~[sv.class:?]
        at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:288) ~[yz.class:?]
        at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:295) ~[mw.class:?]
        ... 10 more