I haven't had a chance to hop on the server while this error has popped up. but it asked that I post it here.

To reproduce the error I am running on a paper client. Other than that I don't know what would have to be done.

Here is the error information:

[09:50:00 ERROR]: [ProtocolLib] INTERNAL ERROR: Unable to intercept a read client packet.
If this problem hasn't already been reported, please open a ticket
at https://github.com/dmulloy2/ProtocolLib/issues with the following data:
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.local.LocalChannel.readInbound(LocalChannel.java:299)
at io.netty.channel.local.LocalChannel.finishPeerRead0(LocalChannel.java:445)
at io.netty.channel.local.LocalChannel.access$400(LocalChannel.java:50)
at io.netty.channel.local.LocalChannel$5.run(LocalChannel.java:403)
at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
at io.netty.channel.DefaultEventLoop.run(DefaultEventLoop.java:54)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:833)
Dump:
Parameters:
io.netty.buffer.PooledUnsafeDirectByteBuf@7bf3043e[
memoryAddress=2671369015360
recyclerHandle=io.netty.util.Recycler$DefaultHandle@255297c6
chunk=Chunk(55e6c501: 1%, 24576/4194304)
handle=1125929971613696
memory=java.nio.DirectByteBuffer[pos=0 lim=4194304 cap=4194304]
offset=16384
length=9
maxLength=16
cache=io.netty.buffer.PoolThreadCache@60472455
tmpNioBuf=
allocator=PooledByteBufAllocator(directByDefault: true)
refCnt=2
readerIndex=9
writerIndex=9
markedReaderIndex=0
markedWriterIndex=0
maxCapacity=2147483647
]
manager:
com.comphenix.protocol.injector.PacketFilterManager@83aa3e8[
unhookTask=com.comphenix.protocol.injector.DelayedSingleTask@3b0b86de
packetListeners=[]
packetInjector=com.comphenix.protocol.injector.netty.ProtocolInjector$5@536403b2
playerInjection=com.comphenix.protocol.injector.netty.ProtocolInjector$4@30814787
inputBufferedPackets=[]
recievedListeners=com.comphenix.protocol.injector.SortedPacketListenerList@6d79879c
sendingListeners=com.comphenix.protocol.injector.SortedPacketListenerList@aa3d19b
hasClosed=false
classLoader=PluginClassLoader{plugin=ProtocolLib v4.8.0, pluginEnabled=true, url=plugins\ProtocolLib.jar}
reporter=com.comphenix.protocol.ProtocolLib$1@43aee733
server=CraftServer{serverName=Paper,serverVersion=git-Paper-17,minecraftVersion=1.19}
library=ProtocolLib v4.8.0
asyncFilterManager=com.comphenix.protocol.async.AsyncFilterManager@76f1e776
knowsServerPackets=true
knowsClientPackets=true
phaseLoginCount=0
phasePlayingCount=0
packetCreation=false
nettyInjector=com.comphenix.protocol.injector.netty.ProtocolInjector@3fbc34ac
pluginVerifier=com.comphenix.protocol.injector.PluginVerifier@3d7c97a
hasRecycleDistance=true
minecraftVersion=(MC: 1.19.0)
debug=false
]
Sender:
com.comphenix.protocol.injector.netty.ChannelInjector@14303c82[
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@4c6839ca
player=com.comphenix.protocol.injector.server.TemporaryPlayerInvocationHandler@59a9c8e9
updated=
playerName=
playerConnection=
networkManager=net.minecraft.network.NetworkManager@12b3bf7
originalChannel=org.geysermc.geyser.network.netty.ChannelWrapper@18dffb16
channelField=VolatileField [accessor=DefaultFieldAccessor [field=public io.netty.channel.Channel net.minecraft.network.NetworkManager.m], container=net.minecraft.network.NetworkManager@12b3bf7, previous=org.geysermc.geyser.network.netty.ChannelWrapper@18dffb16, current=com.comphenix.protocol.injector.netty.ChannelInjector$3@30e19c7a, previousLoaded=true, currentSet=true, forceAccess=true]
packetMarker={}
currentEvent=
finalEvent=
unfilteredProcessedPackets=com.comphenix.protocol.injector.netty.PacketFilterQueue@10b225ca
vanillaDecoder=com.viaversion.viaversion.bukkit.handlers.BukkitDecodeHandler@2c0c79ea
vanillaEncoder=com.viaversion.viaversion.bukkit.handlers.BukkitEncodeHandler@4c54d8f8
finishQueue=[]
channelListener=com.comphenix.protocol.injector.netty.ProtocolInjector@3fbc34ac
processor=com.comphenix.protocol.injector.NetworkProcessor@161a65e2
injected=true
closed=false
cumulation=PooledUnsafeDirectByteBuf(ridx: 9, widx: 9, cap: 9)
cumulator=io.netty.handler.codec.ByteToMessageDecoder$1@59969de2
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-17 (MC: 1.19)

Version Info
I'm running the latest version of protocolLib on paper 1.19-17

Additional context
Add any other context about the problem here.

ProtocolLib v4.8.0 does not support 1.19. Update to a dev version or wait for a stable release

ah ok. good to know. Do we have an ETA on when the next version should release? and where can I find the dev version?

Sorry for the late response! Download the latest dev build here: https://ci.dmulloy2.net/job/ProtocolLib/lastSuccessfulBuild/

(Also, I don't think there is an ETA. I am waiting for the plugin to be production-ready too!)