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.fireChannelRead(ByteToMessageDecoder.java:314)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:435)
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 net.minecraft.server.network.LegacyPingHandler.channelRead(LegacyPingHandler.java:120)
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$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Thread.java:884)
Dump:
Parameters:
io.netty.buffer.PooledUnsafeDirectByteBuf@cf576ccb[
memoryAddress=139739176924304
recyclerHandle=io.netty.util.Recycler$DefaultHandle@88d11f17
chunk=Chunk(aac32ab1: 3%, 90112/4194304)
handle=562980018192384
memory=java.nio.DirectByteBuffer[pos=0 lim=4194304 cap=4194304]
offset=8192
length=20
maxLength=32
cache=io.netty.buffer.PoolThreadCache@d90dfe16
tmpNioBuf=
allocator=PooledByteBufAllocator(directByDefault: true)
refCnt=2
readerIndex=20
writerIndex=20
markedReaderIndex=0
markedWriterIndex=0
maxCapacity=2147483647
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@50481743[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@5f598c61
packetListeners=[PacketAdapter[plugin=DecentHolograms, sending=EMPTY_WHITELIST, receiving=ListeningWhitelist[priority=NORMAL, packets=[USE_ENTITY[class=PacketPlayInUseEntity, id=13]], gamephase=PLAYING, options=[]]], PacketAdapter[plugin=LoginSecurity, sending=ListeningWhitelist[priority=LOW, packets=[WINDOW_DATA[class=PacketPlayOutWindowData, id=21], SET_SLOT[class=PacketPlayOutSetSlot, id=22], WINDOW_ITEMS[class=PacketPlayOutWindowItems, id=20]], gamephase=PLAYING, options=[]], receiving=EMPTY_WHITELIST]]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@897db134
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@88d551cc
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@846143aa
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@b1495425
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.8.0, pluginEnabled=true, url=plugins/ProtocolLib.jar}
reporter=com.comphenix.protocol.ProtocolLib$1@54becc2e
server=CraftServer{serverName=Purpur,serverVersion=git-Purpur-1657,minecraftVersion=1.19}
library=ProtocolLib v4.8.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@c0b3ecea
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=0
phasePlayingCount=2
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@372b4f4d
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@52265f7e
hasRecycleDistance=true
minecraftVersion=(MC: 1.19.0)
debug=false
]
Sender:
com.comphenix.protocol.injector.netty.ChannelInjector@84922404[
decodeBuffer=protected void com.viaversion.viaversion.bukkit.handlers.BukkitDecodeHandler.decode(io.netty.channel.ChannelHandlerContext,io.netty.buffer.ByteBuf,java.util.List) throws java.lang.Exception
encodeBuffer=protected void com.viaversion.viaversion.bukkit.handlers.BukkitEncodeHandler.encode(io.netty.channel.ChannelHandlerContext,java.lang.Object,io.netty.buffer.ByteBuf) throws java.lang.Exception
factory=com.comphenix.protocol.injector.netty.InjectionFactory@f7730b3c
player=com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@7971e62
updated=
playerName=
playerConnection=
networkManager=net.minecraft.network.NetworkManager@4bd12b2a
originalChannel=[id: 0x12965e15, L:/172.18.0.27:25595 - R:/103.25.44.74:51219]
channelField=VolatileField [accessor=DefaultFieldAccessor [field=public io.netty.channel.Channel net.minecraft.network.NetworkManager.m], container=net.minecraft.network.NetworkManager@4bd12b2a, previous=[id: 0x12965e15, L:/172.18.0.27:25595 - R:/103.25.44.74:51219], current=com.comphenix.protocol.injector.netty.ChannelInjector$3@177c1f1f, previousLoaded=true, currentSet=true, forceAccess=true]
packetMarker={}
currentEvent=
finalEvent=
unfilteredProcessedPackets=com.comphenix.protocol.injector.netty.PacketFilterQueue@3fb698cc
vanillaDecoder=com.viaversion.viaversion.bukkit.handlers.BukkitDecodeHandler@bda56b19
vanillaEncoder=com.viaversion.viaversion.bukkit.handlers.BukkitEncodeHandler@24c5cadc
finishQueue=[]
channelListener=com.comphenix.protocol.injector.netty.ProtocolInjector@372b4f4d
processor=com.comphenix.protocol.injector.NetworkProcessor@1e7fc34a
injected=true
closed=false
cumulation=PooledUnsafeDirectByteBuf(ridx: 20, widx: 20, cap: 20)
cumulator=io.netty.handler.codec.ByteToMessageDecoder$1@5f9e098a
singleDecode=false
first=true
firedChannelRead=false
selfFiredChannelRead=true
decodeState=1
discardAfterReads=16
numReads=0
added=true
]
Version:
ProtocolLib v4.8.0
Java Version:
17.0.2
Server:
git-Purpur-1657 (MC: 1.19)

Thank you so much, let me update the same.

Please use the latest development build from https://ci.dmulloy2.net/job/ProtocolLib/lastSuccessfulBuild/ to get 1.19 support