Null pointer exception/kicking java and geyser players

[adamwbb]

Describe the bug
Console is being spammed nonstop with a null pointer exception error.
Software brand
Please let us know what software you are using.
This server is running Paper version git-Paper-388 (MC: 1.20.4) (Implementing API version 1.20.4-R0.1-SNAPSHOT) (Git: 93a848c)

Plugins
Please give us a list of your plugins. Sometimes we run into incompatibilities. Having an overview of the plugins on your server can really help identify the problem quicker.
ViaVersion, ProtocolLib, HolographicDisplays, RealisticVillagers, Multiverse, Tardis, Coreprotect, Geyser, Floodgate, and many more
You may also provide a screenshot.

How To Reproduce
Steps to reproduce the behavior:

1. Join with the Java or Bedrock client
2. player immediately kicked with message was kicked with reason: PacketEvents 2.0 failed to inject
3. console is spammed nonstop

Expected behavior
Players can join without being kicked and console is not spammed.

Additional context
What is spamming console repeatedly.
[14:51:39 WARN]: [com.github.retrooper.packetevents.PacketEventsAPI] PacketEvents caught an unhandled exception while calling your listener. java.lang.NullPointerException: null at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:903) ~[guava-32.1.2-jre.jar:?] at com.google.common.collect.MapMakerInternalMap.put(MapMakerInternalMap.java:2454) ~[guava-32.1.2-jre.jar:?] at io.github.retrooper.packetevents.util.SpigotReflectionUtil.getEntityByIdWithWorldUnsafe(SpigotReflectionUtil.java:1057) ~[packetevents-spigot-2.4.0.jar:?] at io.github.retrooper.packetevents.util.SpigotReflectionUtil.getEntityById(SpigotReflectionUtil.java:1073) ~[packetevents-spigot-2.4.0.jar:?] at me.matsubara.realisticvillagers.handler.protocol.VillagerHandler.onPacketPlaySend(VillagerHandler.java:111) ~[RealisticVillagers-3.3.jar:?] at com.github.retrooper.packetevents.event.SimplePacketListenerAbstract.onPacketSend(SimplePacketListenerAbstract.java:64) ~[packetevents-spigot-2.4.0.jar:?] at com.github.retrooper.packetevents.event.PacketSendEvent.call(PacketSendEvent.java:51) ~[packetevents-spigot-2.4.0.jar:?] at com.github.retrooper.packetevents.event.EventManager.callEvent(EventManager.java:52) ~[packetevents-spigot-2.4.0.jar:?] at com.github.retrooper.packetevents.util.PacketEventsImplHelper.handleClientBoundPacket(PacketEventsImplHelper.java:45) ~[packetevents-spigot-2.4.0.jar:?] at io.github.retrooper.packetevents.injector.handlers.PacketEventsEncoder.handleClientBoundPacket(PacketEventsEncoder.java:82) ~[packetevents-spigot-2.4.0.jar:?] at io.github.retrooper.packetevents.injector.handlers.PacketEventsEncoder.encode(PacketEventsEncoder.java:67) ~[packetevents-spigot-2.4.0.jar:?] at io.github.retrooper.packetevents.injector.handlers.PacketEventsEncoder.encode(PacketEventsEncoder.java:46) ~[packetevents-spigot-2.4.0.jar:?] at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:90) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] at io.github.retrooper.packetevents.injector.handlers.PacketEventsEncoder.write(PacketEventsEncoder.java:101) ~[packetevents-spigot-2.4.0.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:113) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:120) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:881) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at de.codingair.tradesystem.lib.codingapi.player.data.PacketReader$1.write(PacketReader.java:77) ~[TradeSystem_v2.5.3.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at de.codingair.tradesystem.lib.codingapi.player.data.PacketReader$1.write(PacketReader.java:77) ~[TradeSystem_v2.5.3.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.ChannelDuplexHandler.write(ChannelDuplexHandler.java:115) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at me.eccentric_nz.tardischunkgenerator.helpers.TARDISPacketListener$1.write(TARDISPacketListener.java:178) ~[TARDIS.jar:?] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:879) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:863) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:968) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:856) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:1015) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.AbstractChannel.write(AbstractChannel.java:301) ~[netty-transport-4.1.97.Final.jar:4.1.97.Final] at com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.write(NettyChannelProxy.java:210) ~[ProtocolLib.jar:?] at com.comphenix.protocol.injector.netty.channel.NettyChannelProxy.write(NettyChannelProxy.java:199) ~[ProtocolLib.jar:?] at net.minecraft.network.Connection.doSendPacket(Connection.java:448) ~[?:?] at net.minecraft.network.Connection.lambda$sendPacket$10(Connection.java:433) ~[?:?] at com.comphenix.protocol.injector.netty.channel.NettyEventLoopProxy.lambda$proxyRunnable$2(NettyEventLoopProxy.java:48) ~[ProtocolLib.jar:?] at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174) ~[netty-common-4.1.97.Final.jar:4.1.97.Final] at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167) ~[netty-common-4.1.97.Final.jar:4.1.97.Final] at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470) ~[netty-common-4.1.97.Final.jar:4.1.97.Final] at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:413) ~[netty-transport-classes-epoll-4.1.97.Final.jar:4.1.97.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.97.Final.jar:4.1.97.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.97.Final.jar:4.1.97.Final] at java.lang.Thread.run(Thread.java:1583) ~[?:?]