dont know how i got it but i was just randomly testing looked in console and saw this error i thought i just might report it to see if you can just fix it by seeing the error or something
00:10:14 ERROR: [TakaAntiCheat] Unhandled exception occured in onPacketReceiving(PacketEvent) for TakaAntiCheat
java.lang.IllegalStateException: Asynchronous entity world add!
at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.World.b(World.java:2633) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.Chunk.addEntities(Chunk.java:820) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:49) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:115) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:97) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getChunkAt(CraftWorld.java:126) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getBlockAt(CraftWorld.java:90) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getBlockAt(CraftWorld.java:568) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at org.bukkit.Location.getBlock(Location.java:87) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at TAKA.a.onPacketReceiving(a.java) ~[Taka.jar:?]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokeReceivingListener(SortedPacketListenerList.java:114) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.SortedPacketListenerList.invokePacketRecieving(SortedPacketListenerList.java:67) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.PacketFilterManager.handlePacket(PacketFilterManager.java:590) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.PacketFilterManager.invokePacketRecieving(PacketFilterManager.java:557) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ProtocolInjector.packetReceived(ProtocolInjector.java:352) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ProtocolInjector.onPacketReceiving(ProtocolInjector.java:317) [ProtocolLib.jar:4.4.0-b421]
at com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:509) [ProtocolLib.jar:4.4.0-b421]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:249) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:149) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at com.comphenix.protocol.injector.netty.ChannelInjector$2.channelRead(ChannelInjector.java:248) [ProtocolLib.jar:4.4.0-b421]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:150) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
dont know how i got it but i was just randomly testing looked in console and saw this error i thought i just might report it to see if you can just fix it by seeing the error or something
00:10:14 ERROR: [TakaAntiCheat] Unhandled exception occured in onPacketReceiving(PacketEvent) for TakaAntiCheat java.lang.IllegalStateException: Asynchronous entity world add! at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at net.minecraft.server.v1_8_R3.World.b(World.java:2633) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at net.minecraft.server.v1_8_R3.Chunk.addEntities(Chunk.java:820) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:49) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:1) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:337) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:295) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:16) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:115) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at net.minecraft.server.v1_8_R3.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:97) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getChunkAt(CraftWorld.java:126) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getBlockAt(CraftWorld.java:90) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getBlockAt(CraftWorld.java:568) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at org.bukkit.Location.getBlock(Location.java:87) ~[spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at TAKA.a.onPacketReceiving(a.java) ~[Taka.jar:?] at com.comphenix.protocol.injector.SortedPacketListenerList.invokeReceivingListener(SortedPacketListenerList.java:114) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.SortedPacketListenerList.invokePacketRecieving(SortedPacketListenerList.java:67) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.PacketFilterManager.handlePacket(PacketFilterManager.java:590) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.PacketFilterManager.invokePacketRecieving(PacketFilterManager.java:557) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.netty.ProtocolInjector.packetReceived(ProtocolInjector.java:352) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.netty.ProtocolInjector.onPacketReceiving(ProtocolInjector.java:317) [ProtocolLib.jar:4.4.0-b421] at com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:509) [ProtocolLib.jar:4.4.0-b421] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:249) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:149) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at com.comphenix.protocol.injector.netty.ChannelInjector$2.channelRead(ChannelInjector.java:248) [ProtocolLib.jar:4.4.0-b421] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:163) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.handler.timeout.ReadTimeoutHandler.channelRead(ReadTimeoutHandler.java:150) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:333) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:319) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:787) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:130) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116) [spigot-1.8.8.jar:git-Spigot-db6de12-18fbb24] at java.lang.Thread.run(Unknown Source) [?:1.8.0_231]
net.minecraft.server.v1_8_R3.PacketPlayInBlockPlace@6e991f54[ b=BlockPosition{x=0, y=0, z=0} c=255 d=64xitem.bow@379 e=0.0 f=0.0 g=0.0 timestamp=1574669414991 ]