Bukkit

Describe the problem or enhancement (and any steps needed to reproduce the issue):

_

What plugin version are you using? _

Does the issue occur in the previous version of the plugin? _

What server type and version did you use it on? _

If relevant, what other plugins do you use? _

Please add or attach any relevant PlayerHeads plugin configuration.

Please do add or attach any relevant log information or errors.

To add to this, with a bit more information....

PlayerHeads 5.20.2-SNAPSHOT throws error on Paper 1.21.1-12:

[19:10:25 ERROR]: Could not pass event EntityDeathEvent to PlayerHeads v5.20.2-SNAPSHOT
java.lang.IllegalArgumentException: The name of the profile is longer than 16 characters
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:143) ~[guava-32.1.2-jre.jar:?]
at org.bukkit.craftbukkit.profile.CraftPlayerProfile.<init>(CraftPlayerProfile.java:67) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.craftbukkit.profile.CraftPlayerProfile.<init>(CraftPlayerProfile.java:76) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.craftbukkit.inventory.CraftMetaSkull.applyToItem(CraftMetaSkull.java:118) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.craftbukkit.inventory.CraftItemStack.setItemMeta(CraftItemStack.java:432) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.craftbukkit.inventory.CraftItemStack.setItemMeta(CraftItemStack.java:404) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.inventory.ItemStack.setItemMeta(ItemStack.java:650) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
at PlayerHeads-5.20.2-SNAPSHOT.jar/com.github.crashdemons.playerheads.SkullManager.MobSkull(SkullManager.java:121) ~[PlayerHeads-5.20.2-SNAPSHOT.jar:?]
at PlayerHeads-5.20.2-SNAPSHOT.jar/com.github.crashdemons.playerheads.SkullManager.MobSkull(SkullManager.java:86) ~[PlayerHeads-5.20.2-SNAPSHOT.jar:?]
at PlayerHeads-5.20.2-SNAPSHOT.jar/com.github.crashdemons.playerheads.api.ApiProvider.getHeadDrop(ApiProvider.java:108) ~[PlayerHeads-5.20.2-SNAPSHOT.jar:?]
at PlayerHeads-5.20.2-SNAPSHOT.jar/org.shininet.bukkit.playerheads.PlayerHeadsListener.MobDeathHelper(PlayerHeadsListener.java:574) ~[PlayerHeads-5.20.2-SNAPSHOT.jar:?]
at PlayerHeads-5.20.2-SNAPSHOT.jar/org.shininet.bukkit.playerheads.PlayerHeadsListener.onEntityDeath(PlayerHeadsListener.java:325) ~[PlayerHeads-5.20.2-SNAPSHOT.jar:?]
at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.execute(MethodHandleEventExecutor.java:40) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:80) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:1.21.1-12-1798e94]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:131) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:628) ~[paper-mojangapi-1.21.1-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:996) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.world.entity.LivingEntity.dropAllDeathLoot(LivingEntity.java:1878) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.world.entity.LivingEntity.die(LivingEntity.java:1781) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.world.entity.LivingEntity.hurt(LivingEntity.java:1586) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.world.entity.monster.EnderMan.hurt(EnderMan.java:404) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.world.entity.player.Player.attack(Player.java:1379) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.level.ServerPlayer.attack(ServerPlayer.java:2417) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.network.ServerGamePacketListenerImpl$3.onAttack(ServerGamePacketListenerImpl.java:2791) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.network.protocol.game.ServerboundInteractPacket$1.dispatch(ServerboundInteractPacket.java:29) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.network.protocol.game.ServerboundInteractPacket.dispatch(ServerboundInteractPacket.java:89) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleInteract(ServerGamePacketListenerImpl.java:2702) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.network.protocol.game.ServerboundInteractPacket.handle(ServerboundInteractPacket.java:76) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.network.protocol.game.ServerboundInteractPacket.handle(ServerboundInteractPacket.java:14) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:56) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:151) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1537) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:201) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:125) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1514) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1507) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:135) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.managedBlock(MinecraftServer.java:1466) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1473) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1318) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:330) ~[paper-1.21.1.jar:1.21.1-12-1798e94]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

I am not actively developing this project anymore due to life situation changes and time constraints. Someone else is free to fork it.

Otherwise, I would recommend trying out a competing plugin like DropHeads.