Stacktrace on item serialization

[FunixG]

Stack trace

NullPointerException
Cannot invoke "net.minecraft.core.component.DataComponentType.isTransient()" because "dataComponentType" is null

net.minecraft.core.component.DataComponentPatch in lambda$static$1 at line 45
com.mojang.serialization.Encoder$1 in encode at line 25
com.mojang.serialization.Codec$2 in encode at line 80
com.mojang.serialization.Encoder in encodeStart at line 14
com.mojang.serialization.codecs.OptionalFieldCodec in encode at line 44
com.mojang.serialization.codecs.OptionalFieldCodec in encode at line 17
com.mojang.serialization.MapEncoder$1 in encode at line 26
com.mojang.serialization.MapCodec$2 in encode at line 82
com.mojang.serialization.codecs.RecordCodecBuilder$Instance$6 in encode at line 297
com.mojang.serialization.codecs.RecordCodecBuilder$2 in encode at line 112
com.mojang.serialization.MapCodec$MapCodecCodec in encode at line 163
com.mojang.serialization.Codec$RecursiveCodec in encode at line 217
com.mojang.serialization.Encoder in encodeStart at line 14
net.minecraft.world.item.ItemStack in save at line 607
org.bukkit.craftbukkit.util.CraftMagicNumbers in serializeItem at line 525
org.bukkit.inventory.ItemStack in serializeAsBytes at line 774
fr.pacifista.plugins.modules.core.spigot.serialization.ItemSerialization in appendItemStacksToStream at line 59
fr.pacifista.plugins.modules.core.spigot.serialization.InventorySerialization in serializeInventory at line 73
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in getLocalDto at line 113
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in savePlayer at line 80
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in playerQuit at line 56
fr.pacifista.plugins.modules.players.datasync.PlayerDataSyncModule in playerLeave at line 117
fr.pacifista.plugins.modules.core.spigot.MinecraftPlugin in onPlayerLeave at line 284
co.aikar.timings.TimedEventExecutor in execute at line 80
org.bukkit.plugin.RegisteredListener in callEvent at line 70
io.papermc.paper.plugin.manager.PaperEventManager in callEvent at line 54
io.papermc.paper.plugin.manager.PaperPluginManagerImpl in callEvent at line 131
org.bukkit.plugin.SimplePluginManager in callEvent at line 628
net.minecraft.server.players.PlayerList in remove at line 606
net.minecraft.server.players.PlayerList in remove at line 593
net.minecraft.server.network.ServerGamePacketListenerImpl in removePlayerFromWorld at line 2157
net.minecraft.server.network.ServerGamePacketListenerImpl in onDisconnect at line 2134
net.minecraft.server.network.ServerGamePacketListenerImpl in onDisconnect at line 2120
net.minecraft.network.Connection in handleDisconnection at line 933
io.papermc.paper.threadedregions.RegionizedWorldData in tickConnections at line 508
net.minecraft.server.MinecraftServer in tickChildren at line 1849
net.minecraft.server.MinecraftServer in tickServer at line 1668
io.papermc.paper.threadedregions.TickRegions$ConcreteRegionTickHandle in tickRegion at line 407
io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle in runTick at line 418
ca.spottedleaf.concurrentutil.scheduler.SchedulerThreadPool$TickThreadRunner in run at line 546
java.lang.Thread in run at line 1583

Plugin and Datapack List

Only custom plugins. The stacktrace has been thrown while I was saving a player inventory item by item.

Actions to reproduce (if known)

No response

Folia version

[13:20:19 INFO]: Checking version, please wait...
[13:20:20 INFO]: This server is running Folia version 1.21.4-DEV-dev/hard-fork@d3969cd (1970-01-01T00:00:00Z) (Implementing API version 1.21.4-R0.1-SNAPSHOT)
You are running the latest version
Previous version: 1.21.4-DEV-6265eb6 (MC: 1.21.4)

Other

No response

[FunixG]

I have an other stacktrace for a serialization

ClassCastException

class java.lang.Integer cannot be cast to class net.minecraft.world.item.enchantment.ItemEnchantments (java.lang.Integer is in module java.base of loader 'bootstrap'; net.minecraft.world.item.enchantment.ItemEnchantments is in unnamed module of loader java.net.URLClassLoader @736e9adb)

com.mojang.serialization.codecs.RecordCodecBuilder$Instance in lambda$ap2$4 at line 215
com.mojang.serialization.codecs.RecordCodecBuilder$2 in encode at line 112
com.mojang.serialization.MapCodec$MapCodecCodec in encode at line 163
com.mojang.serialization.codecs.EitherCodec in lambda$encode$3 at line 34
com.mojang.datafixers.util.Either$Left in map at line 38
com.mojang.serialization.codecs.EitherCodec in encode at line 33
com.mojang.serialization.codecs.EitherCodec in encode at line 11
com.mojang.serialization.Encoder$1 in encode at line 25
com.mojang.serialization.Codec$2 in encode at line 80
com.mojang.serialization.Encoder in encodeStart at line 14
net.minecraft.util.EncoderCache$Key in resolve at line 46
net.minecraft.util.EncoderCache$1 in load at line 23
net.minecraft.util.EncoderCache$1 in load at line 20
com.google.common.cache.LocalCache$LoadingValueReference in loadFuture at line 3574
com.google.common.cache.LocalCache$Segment in loadSync at line 2316
com.google.common.cache.LocalCache$Segment in lockedGetOrLoad at line 2189
com.google.common.cache.LocalCache$Segment in get at line 2079
com.google.common.cache.LocalCache in get at line 4017
com.google.common.cache.LocalCache in getOrLoad at line 4040
com.google.common.cache.LocalCache$LocalLoadingCache in get at line 4989
com.google.common.cache.LocalCache$LocalLoadingCache in getUnchecked at line 4996
net.minecraft.util.EncoderCache$2 in encode at line 38
com.mojang.serialization.Encoder in encodeStart at line 14
com.mojang.serialization.codecs.DispatchedMapCodec in encodeValue at line 35
com.mojang.serialization.codecs.DispatchedMapCodec in encode at line 28
com.mojang.serialization.codecs.DispatchedMapCodec in encode at line 20
com.mojang.serialization.Encoder$1 in encode at line 25
com.mojang.serialization.Codec$2 in encode at line 80
com.mojang.serialization.Encoder in encodeStart at line 14
com.mojang.serialization.codecs.OptionalFieldCodec in encode at line 44
com.mojang.serialization.codecs.OptionalFieldCodec in encode at line 17
com.mojang.serialization.MapEncoder$1 in encode at line 26
com.mojang.serialization.MapCodec$2 in encode at line 82
com.mojang.serialization.codecs.RecordCodecBuilder$Instance$6 in encode at line 297
com.mojang.serialization.codecs.RecordCodecBuilder$2 in encode at line 112
com.mojang.serialization.MapCodec$MapCodecCodec in encode at line 163
com.mojang.serialization.Codec$RecursiveCodec in encode at line 217
com.mojang.serialization.Encoder in encodeStart at line 14
net.minecraft.world.item.ItemStack in save at line 607
org.bukkit.craftbukkit.util.CraftMagicNumbers in serializeItem at line 525
org.bukkit.inventory.ItemStack in serializeAsBytes at line 774
fr.pacifista.plugins.modules.core.spigot.serialization.ItemSerialization in appendItemStacksToStream at line 59
fr.pacifista.plugins.modules.core.spigot.serialization.InventorySerialization in serializeInventory at line 73
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in getLocalDto at line 113
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in saveConnectedPlayers at line 67
fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler in stopModule at line 34
fr.pacifista.plugins.modules.players.datasync.PlayerDataSyncModule in stopModule at line 83
fr.pacifista.plugins.modules.core.spigot.MinecraftPlugin in onDisable at line 221
org.bukkit.plugin.java.JavaPlugin in setEnabled at line 286
io.papermc.paper.plugin.manager.PaperPluginInstanceManager in disablePlugin at line 237
io.papermc.paper.plugin.manager.PaperPluginInstanceManager in disablePlugins at line 161
io.papermc.paper.plugin.manager.PaperPluginManagerImpl in disablePlugins at line 97
org.bukkit.plugin.SimplePluginManager in disablePlugins at line 541
org.bukkit.craftbukkit.CraftServer in disablePlugins at line 626
net.minecraft.server.MinecraftServer in stopServer at line 1076
net.minecraft.server.dedicated.DedicatedServer in stopServer at line 767
io.papermc.paper.threadedregions.RegionShutdownThread in run at line 163

[electronicboy]

Provide an actual jvm stacktrace, not whatever the heck that mess is

[FunixG]

Oh yeah sorry, this was some Sentry stacktraces.

Well I found more relevant stacktrace. The players are using some inventory sorter mods and causes issues.
I have a i9-12900k CPU and the server has 22gigs of ram allocated

[20:52:36] [Region Scheduler Thread #2/ERROR]: [CustomItemEventsListener] Le joueur YOUENN_ll à délenché une erreur avec un item custom lors d'un event BlockBreakEvent
java.lang.NullPointerException: null
	at java.base/java.util.Objects.requireNonNull(Objects.java:233) ~[?:?]
	at java.base/java.util.ImmutableCollections$SetN.contains(ImmutableCollections.java:944) ~[?:?]
	at org.bukkit.craftbukkit.inventory.CraftMetaItem.updateFromPatch(CraftMetaItem.java:543) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftMetaItem.<init>(CraftMetaItem.java:399) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemMetas.lambda$static$2(CraftItemMetas.java:52) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemType.getItemMeta(CraftItemType.java:119) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:431) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:422) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:417) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:387) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.items.CustomItemBuilder.readPersistentData(CustomItemBuilder.java:111) ~[PacifistaPlugin.jar:?]
	at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.items.custom.CustomItemEventsListener.itemHasSameMetadataId(CustomItemEventsListener.java:130) ~[PacifistaPlugin.jar:?]
	at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.items.custom.CustomItemEventsListener.itemIsCustomItem(CustomItemEventsListener.java:126) ~[PacifistaPlugin.jar:?]
	at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.items.custom.CustomItemEventsListener.onInteractEvent(CustomItemEventsListener.java:74) ~[PacifistaPlugin.jar:?]
	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:603) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:559) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:554) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:550) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.server.network.ServerGamePacketListenerImpl.handleAnimate(ServerGamePacketListenerImpl.java:2613) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.protocol.game.ServerboundSwingPacket.handle(ServerboundSwingPacket.java:34) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.protocol.game.ServerboundSwingPacket.handle(ServerboundSwingPacket.java:9) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$1(PacketUtils.java:31) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$2(PacketUtils.java:55) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.papermc.paper.threadedregions.EntityScheduler.executeTick(EntityScheduler.java:181) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1658) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.papermc.paper.threadedregions.TickRegions$ConcreteRegionTickHandle.tickRegion(TickRegions.java:407) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle.runTick(TickRegionScheduler.java:418) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at ca.spottedleaf.concurrentutil.scheduler.SchedulerThreadPool$TickThreadRunner.run(SchedulerThreadPool.java:546) ~[concurrentutil-0.0.3.jar:?]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[20:52:36] [Netty Epoll Server IO #0/ERROR]: Error sending packet clientbound/minecraft:container_set_slot
io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:container_set_slot'
	at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:13) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:27) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at net.minecraft.network.Connection$2.write(Connection.java:795) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:956) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:982) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:950) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:1000) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:974) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:305) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
	at net.minecraft.network.Connection.doSendPacket(Connection.java:529) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:516) ~[folia-1.21.4.jar:1.21.4-DEV-d3969cd]
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:405) ~[netty-transport-classes-epoll-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

[FunixG]

I will try the branch in beta with the new scheduler to see if the problem persists

[FunixG]

Hello ! With the branch beta/new-scheduler the issue is still there but with no stacktrace. Some players are complaining about enchantments that disapears on their pickaxe. For information the item has an uuid in NBT tags to permit a custom plugin to know if this is a special item.

[electronicboy]

Are those clients in creative mode or something? it would generally seem like they've somehow created invalid item stacks somehow; Would maybe need to see what one of these stacks look like, these NBT tags are inside of the custom_data component, right?

[FunixG]

The clients are in survival mode, I can send you the code to generate custom items that I am using, maybe I am doing something wrong :

    private static ItemStack generateItemAndAddId(final CustomItemBuilder builder, final UUID uuid, final MinecraftPlugin minecraftPlugin) {
        builder.setPersistentData(CustomItemEventsListener.METADATA_KEY, uuid.toString());
        return builder.toItemStack();
    }

public class CustomItemBuilder {

    private final List<Component> lore = new ArrayList<>();
    private final Map<Enchantment, Integer> enchantments = new HashMap<>();

    private final Material material;
    private final Integer amount;
    private Component name;

    private NamespacedKey namespacedKey;
    private String nameSpaceData;

    public CustomItemBuilder(@NonNull Material material, @NonNull Integer amount) {
        if (amount < 0) {
            this.amount = 1;
        } else {
            this.amount = amount;
        }

        this.material = material;
    }

    public void setPersistentData(@NonNull final NamespacedKey namespacedKey, @NonNull final String value) {
        this.namespacedKey = namespacedKey;
        this.nameSpaceData = value;
    }

    public ItemStack toItemStack() {
        final ItemStack item = new ItemStack(material, amount);
        final ItemMeta meta = item.getItemMeta();

        if (meta != null) {
            if (name != null) {
                meta.displayName(name);
            }

            if (!lore.isEmpty()) {
                meta.lore(lore);
            }

            for (Map.Entry<Enchantment, Integer> entry : enchantments.entrySet()) {
                meta.addEnchant(entry.getKey(), entry.getValue(), true);
            }

            if (this.namespacedKey != null && this.nameSpaceData != null) {
                meta.getPersistentDataContainer().set(this.namespacedKey, PersistentDataType.STRING, this.nameSpaceData);
            }

            item.setItemMeta(meta);
        }
        return item;
    }
}

[FunixG]

I got a new exception using the branch beta

[18:11:55 ERROR]: Error sending packet clientbound/minecraft:container_set_slot
io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:container_set_slot'
        at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:55) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.network.codec.IdDispatchCodec.encode(IdDispatchCodec.java:13) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:27) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.network.PacketEncoder.encode(PacketEncoder.java:12) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.netty.handler.codec.MessageToByteEncoder.write(MessageToByteEncoder.java:107) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:113) ~[netty-codec-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:875) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:984) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:868) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.ChannelOutboundHandlerAdapter.write(ChannelOutboundHandlerAdapter.java:113) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at net.minecraft.network.Connection$2.write(Connection.java:795) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:893) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:956) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:982) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:950) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:1000) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.DefaultChannelPipeline.writeAndFlush(DefaultChannelPipeline.java:974) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.AbstractChannel.writeAndFlush(AbstractChannel.java:305) ~[netty-transport-4.1.115.Final.jar:4.1.115.Final]
        at net.minecraft.network.Connection.doSendPacket(Connection.java:529) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.network.Connection.lambda$sendPacket$13(Connection.java:516) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:405) ~[netty-transport-classes-epoll-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-common-4.1.115.Final.jar:4.1.115.Final]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: java.lang.NullPointerException
[18:11:55 INFO]: YOUENN_ll lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:container_set_slot'
[18:11:55 ERROR]: [PacifistaPlugin] Erreur lors du leave d'un joueur. Username: YOUENN_ll UUID: 8e7b84df-48ec-4334-8b9b-e206b0b677af
fr.pacifista.plugins.modules.core.PacifistaException: Une erreur est survenue lors de l'envoi de votre inventaire vers le serveur.
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.serialization.InventorySerialization.serializeInventory(InventorySerialization.java:77) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler.getLocalDto(InventorySyncHandler.java:113) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler.savePlayer(InventorySyncHandler.java:80) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.players.datasync.handlers.InventorySyncHandler.playerQuit(InventorySyncHandler.java:56) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.players.datasync.PlayerDataSyncModule.playerLeave(PlayerDataSyncModule.java:117) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.MinecraftPlugin.onPlayerLeave(MinecraftPlugin.java:284) ~[PacifistaPlugin.jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at net.minecraft.server.players.PlayerList.remove(PlayerList.java:606) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.players.PlayerList.remove(PlayerList.java:593) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.removePlayerFromWorld(ServerGamePacketListenerImpl.java:2157) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:2134) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:2120) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.network.Connection.handleDisconnection(Connection.java:933) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.RegionizedWorldData.tickConnections(RegionizedWorldData.java:515) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1850) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1669) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.TickRegions$ConcreteRegionTickHandle.tickRegion(TickRegions.java:471) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.TickRegionScheduler$RegionScheduleHandle.runTick(TickRegionScheduler.java:411) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.ScheduledTaskThreadPool$SchedulableTick.tick(ScheduledTaskThreadPool.java:573) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.ScheduledTaskThreadPool$TickThreadRunner.doTick(ScheduledTaskThreadPool.java:1090) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.ScheduledTaskThreadPool$TickThreadRunner.doRun(ScheduledTaskThreadPool.java:1137) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at io.papermc.paper.threadedregions.ScheduledTaskThreadPool$TickThreadRunner.run(ScheduledTaskThreadPool.java:1172) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
Caused by: fr.pacifista.plugins.modules.core.PacifistaException: Erreur lors de la sérialisation des items.
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.serialization.ItemSerialization.appendItemStacksToStream(ItemSerialization.java:64) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.serialization.InventorySerialization.serializeInventory(InventorySerialization.java:73) ~[PacifistaPlugin.jar:?]
        ... 26 more
Caused by: java.lang.NullPointerException: Cannot invoke "net.minecraft.core.component.DataComponentType.isTransient()" because "dataComponentType" is null
        at net.minecraft.core.component.DataComponentPatch.lambda$static$1(DataComponentPatch.java:45) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at com.mojang.serialization.Encoder$1.encode(Encoder.java:25) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.Codec$2.encode(Codec.java:80) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.Encoder.encodeStart(Encoder.java:14) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.codecs.OptionalFieldCodec.encode(OptionalFieldCodec.java:44) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.codecs.OptionalFieldCodec.encode(OptionalFieldCodec.java:17) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.MapEncoder$1.encode(MapEncoder.java:26) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.MapCodec$2.encode(MapCodec.java:82) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.codecs.RecordCodecBuilder$Instance$6.encode(RecordCodecBuilder.java:297) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.codecs.RecordCodecBuilder$2.encode(RecordCodecBuilder.java:112) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.MapCodec$MapCodecCodec.encode(MapCodec.java:163) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.Codec$RecursiveCodec.encode(Codec.java:217) ~[datafixerupper-8.0.16.jar:?]
        at com.mojang.serialization.Encoder.encodeStart(Encoder.java:14) ~[datafixerupper-8.0.16.jar:?]
        at net.minecraft.world.item.ItemStack.save(ItemStack.java:607) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at org.bukkit.craftbukkit.util.CraftMagicNumbers.serializeItem(CraftMagicNumbers.java:525) ~[folia-1.21.4.jar:1.21.4-DEV-bb12eee]
        at org.bukkit.inventory.ItemStack.serializeAsBytes(ItemStack.java:774) ~[folia-api-1.21.4-R0.1-SNAPSHOT.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.serialization.ItemSerialization.appendItemStacksToStream(ItemSerialization.java:59) ~[PacifistaPlugin.jar:?]
        at PacifistaPlugin.jar/fr.pacifista.plugins.modules.core.spigot.serialization.InventorySerialization.serializeInventory(InventorySerialization.java:73) ~[PacifistaPlugin.jar:?]
        ... 26 more
[18:11:55 INFO]: [voicechat] Disconnecting client YOUENN_ll
[18:11:55 WARN]: Failed to save player data for YOUENN_ll

[electronicboy]

You have an itemstack with a null entry inside of the component patch map