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:529)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:468)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at ProtocolLib.jar//com.comphenix.protocol.injector.netty.ChannelInjector$2.channelRead(ChannelInjector.java:292)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:346)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:318)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at net.minecraft.server.network.LegacyPingHandler.channelRead(LegacyPingHandler.java:122)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:444)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.handler.flush.FlushConsolidationHandler.channelRead(FlushConsolidationHandler.java:152)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
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:499)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:397)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Thread.java:833)
Dump:
Parameters:
io.netty.buffer.PooledUnsafeDirectByteBuf@2850e3ff[
memoryAddress=140643000375184
recyclerHandle=io.netty.util.Recycler$DefaultHandle@1fd9cfd
chunk=Chunk(44cf372: 1%, 32768/4194304)
handle=1125929971613697
memory=java.nio.DirectByteBuffer[pos=0 lim=4194304 cap=4194304]
offset=16640
length=256
maxLength=256
cache=io.netty.buffer.PoolThreadCache@7c9075ff
tmpNioBuf=
allocator=PooledByteBufAllocator(directByDefault: true)
refCnt=2
readerIndex=1
writerIndex=1
markedReaderIndex=0
markedWriterIndex=0
maxCapacity=2147483647
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@4b667d09[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@518a30d5
packetListeners=[PacketAdapter[plugin=LiteBans, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[CHAT[class=PacketPlayInChat, id=3]], gamephase=PLAYING, options=[ASYNC]]], PacketAdapter[plugin=Citizens, sending=ListeningWhitelist[priority=MONITOR, packets=[ENTITY_HEAD_ROTATION[class=PacketPlayOutEntityHeadRotation, id=62], ENTITY_LOOK[class=PacketPlayOutEntityLook, id=43]], gamephase=PLAYING, options=[]], receiving=EMPTY_WHITELIST], PacketAdapter[plugin=SuperiorSkyblock2, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[SETTINGS[class=PacketPlayInSettings, id=5]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=DecentHolograms, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[USE_ENTITY[class=PacketPlayInUseEntity, id=13]], gamephase=PLAYING, options=[ASYNC]]], PacketAdapter[plugin=LiteBans, sending=ListeningWhitelist[priority=NORMAL, packets=[DISCONNECT[class=PacketLoginOutDisconnect, id=0]], gamephase=PLAYING, options=[ASYNC]], receiving=EMPTY_WHITELIST], PacketAdapter[plugin=Citizens, sending=ListeningWhitelist[priority=HIGHEST, packets=[PLAYER_INFO[class=ClientboundPlayerInfoUpdatePacket, id=54]], gamephase=PLAYING, options=[]], receiving=EMPTY_WHITELIST]]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@75d98d75
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@32c8fcd6
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@4abe41b3
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@4a32cca9
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.8.0, pluginEnabled=true, url=plugins/ProtocolLib.jar}
reporter=com.comphenix.protocol.ProtocolLib$1@73b952bf
server=CraftServer{serverName=Paper,serverVersion=git-Paper-448,minecraftVersion=1.19.3}
library=ProtocolLib v4.8.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@3e6954e4
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=1
phasePlayingCount=6
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@38ca1cc1
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@4ede597c
hasRecycleDistance=true
minecraftVersion=(MC: 1.19.3)
debug=false
]
Sender:
com.comphenix.protocol.injector.netty.ChannelInjector@551c7d9b[
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@c1beffd
player=com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@7b6087e7
updated=
playerName=
playerConnection=
networkManager=net.minecraft.network.NetworkManager@18543c9a
originalChannel=[id: 0x304557bc, L:/172.18.0.4:1025 - R:/172.18.0.1:33612]
channelField=VolatileField [accessor=DefaultFieldAccessor [field=public io.netty.channel.Channel net.minecraft.network.NetworkManager.m], container=net.minecraft.network.NetworkManager@18543c9a, previous=[id: 0x304557bc, L:/172.18.0.4:1025 - R:/172.18.0.1:33612], current=com.comphenix.protocol.injector.netty.ChannelInjector$3@5152c42e, previousLoaded=true, currentSet=true, forceAccess=true]
packetMarker={}
currentEvent=
finalEvent=
unfilteredProcessedPackets=com.comphenix.protocol.injector.netty.PacketFilterQueue@2e722e5c
vanillaDecoder=net.minecraft.network.PacketDecoder@17fb77e4
vanillaEncoder=net.minecraft.network.PacketEncoder@54438374
finishQueue=[]
channelListener=com.comphenix.protocol.injector.netty.ProtocolInjector@38ca1cc1
processor=com.comphenix.protocol.injector.NetworkProcessor@2c48928a
injected=true
closed=false
cumulation=PooledUnsafeDirectByteBuf(ridx: 1, widx: 1, cap: 256)
cumulator=io.netty.handler.codec.ByteToMessageDecoder$1@23b23c3d
singleDecode=false
first=true
firedChannelRead=true
selfFiredChannelRead=true
decodeState=1
discardAfterReads=16
numReads=0
added=true
]
Version:
ProtocolLib v4.8.0
Java Version:
17.0.6
Server:
git-Paper-448 (MC: 1.19.3)

Please use the latest pre-release for 1.19+ support: https://github.com/dmulloy2/ProtocolLib/releases/tag/5.0.0-rc1. Protocol Lib 4.8.0 does not support these versions of Minecraft.