12:31:17] [Server thread/ERROR]: Couldn't pick item

12:31:17] [Server thread/ERROR]: Couldn't pick itemjava.lang.IndexOutOfBoundsException: null at io.netty.buffer.EmptyByteBuf.readByte(EmptyByteBuf.java:531) ~[craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketDataSerializer.readByte(PacketDataSerializer.java:675) ~[craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketDataSerializer.g(PacketDataSerializer.java:149) ~[craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:2541) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketPlayInCustomPayload.a(SourceFile:58) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketPlayInCustomPayload.a(SourceFile:8) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_172] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_172] at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at java.lang.Thread.run(Unknown Source) [?:1.8.0_172][12:31:17] [Server thread/INFO]: Korea_South_ lost connection: Invalid pick item![12:31:17] [Server thread/INFO]: Korea_South_ 님이 Kite서버에서 퇴장하셨습니다.

[12:31:17] [Server thread/ERROR]: Couldn't select tradejava.lang.IndexOutOfBoundsException: null at io.netty.buffer.EmptyByteBuf.readInt(EmptyByteBuf.java:581) ~[craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketDataSerializer.readInt(PacketDataSerializer.java:715) ~[craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:2298) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketPlayInCustomPayload.a(SourceFile:58) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PacketPlayInCustomPayload.a(SourceFile:8) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_172] at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_172] at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [craftbukkit.jar:git-Spigot-642f6d2-6103339] at java.lang.Thread.run(Unknown Source) [?:1.8.0_172][12:31:17] [Server thread/WARN]: handleDisconnection() called twice