Stack Trace:
java.lang.IllegalArgumentException: Unable to find a field null with the type com.mojang.authlib.GameProfile in net.minecraft.network.protocol.login.PacketLoginInStart
at ProtocolLib.jar//com.comphenix.protocol.reflect.FuzzyReflection.getFieldByType(FuzzyReflection.java:397)
at ProtocolLib.jar//com.comphenix.protocol.reflect.accessors.Accessors.getFieldAccessor(Accessors.java:57)
at ProtocolLib.jar//com.comphenix.protocol.injector.netty.ChannelInjector.handleLogin(ChannelInjector.java:658)
at ProtocolLib.jar//com.comphenix.protocol.injector.netty.ChannelInjector.decode(ChannelInjector.java:591)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:510)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:449)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:279)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at ProtocolLib.jar//com.comphenix.protocol.injector.netty.ChannelInjector$2.channelRead(ChannelInjector.java:292)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:327)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:299)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.handler.flush.FlushConsolidationHandler.channelRead(FlushConsolidationHandler.java:152)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:800)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:487)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:385)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Thread.java:833)
Dump:
Parameters:
io.netty.buffer.PooledUnsafeDirectByteBuf@7e8c1263[
memoryAddress=140030701797248
recyclerHandle=NOOP_HANDLE
chunk=Chunk(5f4fe8ce: 1%, 32768/4194304)
handle=1125929971613696
memory=java.nio.DirectByteBuffer[pos=0 lim=4194304 cap=4194304]
offset=16384
length=9
maxLength=16
cache=io.netty.buffer.PoolThreadCache@3c0c8a54
tmpNioBuf=
allocator=PooledByteBufAllocator(directByDefault: true)
refCnt=2
readerIndex=9
writerIndex=9
markedReaderIndex=0
markedWriterIndex=0
maxCapacity=2147483647
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@699a99c5[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@1a2dbb39
packetListeners=[PacketAdapter[plugin=Orebfuscator, sending=ListeningWhitelist[priority=NORMAL, packets=[UNLOAD_CHUNK[class=PacketPlayOutUnloadChunk, id=29]], gamephase=PLAYING, options=[]], receiving=EMPTY_WHITELIST], com.comphenix.protocol.async.NullPacketListener@310e47a4]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@5b48b3e
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@35a36514
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@8ca86d4
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@7f490087
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.8.0, pluginEnabled=true, url=plugins/ProtocolLib.jar}
reporter=com.comphenix.protocol.ProtocolLib$1@48ac87f0
server=CraftServer{serverName=Paper,serverVersion=git-Paper-191,minecraftVersion=1.19.2}
library=ProtocolLib v4.8.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@6f449dd5
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=0
phasePlayingCount=2
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@290522b3
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@301348f3
hasRecycleDistance=true
minecraftVersion=(MC: 1.19.2)
debug=false
]
Sender:
com.comphenix.protocol.injector.netty.ChannelInjector@e447d6c[
decodeBuffer=protected void net.minecraft.network.PacketDecoder.decode(io.netty.channel.ChannelHandlerContext,io.netty.buffer.ByteBuf,java.util.List) throws java.lang.Exception
encodeBuffer=protected void net.minecraft.network.PacketEncoder.encode(io.netty.channel.ChannelHandlerContext,java.lang.Object,io.netty.buffer.ByteBuf) throws java.lang.Exception
factory=com.comphenix.protocol.injector.netty.InjectionFactory@144e57c4
player=com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@5f27d02c
updated=
playerName=
playerConnection=
networkManager=net.minecraft.network.NetworkManager@7f8e5a9e
originalChannel=[id: 0x3a53b255, L:/193.135.10.115:15036 - R:/46.119.158.153:51568]
channelField=VolatileField [accessor=DefaultFieldAccessor [field=public io.netty.channel.Channel net.minecraft.network.NetworkManager.m], container=net.minecraft.network.NetworkManager@7f8e5a9e, previous=[id: 0x3a53b255, L:/193.135.10.115:15036 - R:/46.119.158.153:51568], current=com.comphenix.protocol.injector.netty.ChannelInjector$3@a0a8781, previousLoaded=true, currentSet=true, forceAccess=true]
packetMarker={}
currentEvent=
finalEvent=
unfilteredProcessedPackets=com.comphenix.protocol.injector.netty.PacketFilterQueue@6b4d905c
vanillaDecoder=net.minecraft.network.PacketDecoder@661a7d01
vanillaEncoder=net.minecraft.network.PacketEncoder@fcc87a
finishQueue=[]
channelListener=com.comphenix.protocol.injector.netty.ProtocolInjector@290522b3
processor=com.comphenix.protocol.injector.NetworkProcessor@59dcc595
injected=true
closed=false
cumulation=PooledUnsafeDirectByteBuf(ridx: 9, widx: 9, cap: 9)
cumulator=io.netty.handler.codec.ByteToMessageDecoder$1@f9496c4
singleDecode=false
first=true
firedChannelRead=false
selfFiredChannelRead=true
decodeState=1
discardAfterReads=16
numReads=0
added=true
]
Version:
ProtocolLib v4.8.0
Java Version:
17.0.1
Server:
git-Paper-191 (MC: 1.19.2)

This Error spams in the console

Fixed in #1860.
Please use the latest dev version that supports 1.19.