org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.cursemc.cursebosses.listeners.EntityDamageListener.handleAddition(EntityDamageListener.java:55) [CurseCore.jar:?]
        at net.cursemc.cursebosses.listeners.EntityDamageListener.onBossDamage(EntityDamageListener.java:35) [CurseCore.jar:?]
        at sun.reflect.GeneratedMethodAccessor236.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:87) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:553) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:466) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:585) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityLiving.d(EntityLiving.java:1112) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:748) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityMonster.damageEntity(EntityMonster.java:42) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityWither.damageEntity(EntityWither.java:434) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:1002) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1086) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1382) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:52) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:11) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_111]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_111]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]
Caused by: java.lang.IllegalArgumentException: effect type cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.potion.PotionEffect.<init>(PotionEffect.java:42) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.potion.PotionEffect.<init>(PotionEffect.java:60) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.potion.PotionEffect.<init>(PotionEffect.java:72) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]
        at net.cursemc.cursebosses.SkillHandler.applyEffects(SkillHandler.java:51) ~[?:?]
        at net.cursemc.cursebosses.listeners.BossSkillListener.onBossSkill(BossSkillListener.java:28) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor327.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_111]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_111]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[paperspigot-1.8.8.jar:git-PaperSpigot-"4c7641d"]