java.lang.IllegalArgumentException: object is not an instance of declaring class

[CaptainShadow10]

Bug Report 🐛

Plugin Version

Latest-1.5.6

Server Version

Paper-1.20.4

StackTrace

at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?] at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:81) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:git-Paper-342] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.20.4.jar:git-Paper-342] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:126) ~[paper-1.20.4.jar:git-Paper-342] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:615) ~[paper-api-1.20.4-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.v1_20_R3.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:991) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.server.level.ServerPlayer.die(ServerPlayer.java:968) ~[?:?] at net.minecraft.world.entity.LivingEntity.hurt(LivingEntity.java:1555) ~[?:?] at net.minecraft.world.entity.player.Player.hurt(Player.java:968) ~[?:?] at net.minecraft.server.level.ServerPlayer.hurt(ServerPlayer.java:1134) ~[?:?] at net.minecraft.world.entity.player.Player.attack(Player.java:1321) ~[?:?] at net.minecraft.server.level.ServerPlayer.attack(ServerPlayer.java:2282) ~[?:?] at net.minecraft.server.network.ServerGamePacketListenerImpl$3.a(ServerGamePacketListenerImpl.java:2780) ~[?:?] at net.minecraft.network.protocol.game.ServerboundInteractPacket$1.dispatch(ServerboundInteractPacket.java:24) ~[?:?] at net.minecraft.network.protocol.game.ServerboundInteractPacket.dispatch(ServerboundInteractPacket.java:80) ~[?:?] at net.minecraft.server.network.ServerGamePacketListenerImpl.handleInteract(ServerGamePacketListenerImpl.java:2704) ~[?:?] at net.minecraft.network.protocol.game.ServerboundInteractPacket.handle(ServerboundInteractPacket.java:67) ~[?:?] at net.minecraft.network.protocol.game.ServerboundInteractPacket.handle(ServerboundInteractPacket.java:12) ~[?:?] at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:54) ~[?:?] at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?] at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?] at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1458) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:194) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?] at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1435) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1358) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?] at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1336) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1220) ~[paper-1.20.4.jar:git-Paper-342] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:321) ~[paper-1.20.4.jar:git-Paper-342] at java.lang.Thread.run(Thread.java:1583) ~[?:?] Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class at jdk.internal.reflect.DirectMethodHandleAccessor.checkReceiver(DirectMethodHandleAccessor.java:197) ~[?:?] at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:99) ~[?:?] at java.lang.reflect.Method.invoke(Method.java:580) ~[?:?] at com.github.evancolewright.headdrops.nbtapi.utils.nmsmappings.ReflectionMethod.run(ReflectionMethod.java:183) ~[HeadDrops-1.5.6.jar:?] ... 38 more

Steps to Reproduce

Its been happening since I installed it