[16:08:15 ERROR]: Could not pass event EntityDeathEvent to IronGolemTweaks v0.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:378) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at net.minecraft.server.v1_8_R3.EntityLiving.die(EntityLiving.java:879) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at net.minecraft.server.v1_8_R3.EntityIronGolem.die(EntityIronGolem.java:182) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:817) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.entity.CraftLivingEntity.damage(CraftLivingEntity.java:241) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.entity.CraftLivingEntity.damage(CraftLivingEntity.java:229) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at kr.kieran.irongolemtweaks.events.IronGolemTakeDamage$1.run(IronGolemTakeDamage.java:34) [IronGolemTweaks.jar:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53) [deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:?]
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:?]
        at java.base/java.lang.Thread.run(Unknown Source) [?:?]
Caused by: java.lang.IllegalStateException: Asynchronous entity add!
        at org.spigotmc.AsyncCatcher.catchOp(AsyncCatcher.java:14) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at net.minecraft.server.v1_8_R3.World.addEntity(World.java:991) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at net.minecraft.server.v1_8_R3.World.addEntity(World.java:987) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.dropItem(CraftWorld.java:331) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.dropItemNaturally(CraftWorld.java:370) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        at kr.kieran.irongolemtweaks.events.IronGolemTakeDamage.on(IronGolemTakeDamage.java:50) ~[?:?]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
        at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[deities.jar:git-PaperSpigot-4a647dc-12698ea]
        ... 15 more