[18:36:09] [Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to AureliumSkills vAlpha 1.1.3
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:319) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:245) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:958) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:845) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:801) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:990) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.EntityLiving.damageEntity0(EntityLiving.java:1755) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.EntityLiving.damageEntity(EntityLiving.java:1138) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.EntityMonster.damageEntity(SourceFile:72) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.EntityZombie.damageEntity(EntityZombie.java:234) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.bukkit.craftbukkit.v1_16_R1.entity.CraftLivingEntity.damage(CraftLivingEntity.java:262) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at org.mcmonkey.sentinel.SentinelWeaponHelper.punch(SentinelWeaponHelper.java:252) ~[?:?]
        at org.mcmonkey.sentinel.SentinelAttackHelper.tryAttackInternal(SentinelAttackHelper.java:324) ~[?:?]
        at org.mcmonkey.sentinel.SentinelAttackHelper.tryAttack(SentinelAttackHelper.java:105) ~[?:?]
        at org.mcmonkey.sentinel.SentinelTrait.runUpdate(SentinelTrait.java:1309) ~[?:?]
        at org.mcmonkey.sentinel.SentinelTrait.run(SentinelTrait.java:1514) ~[?:?]
        at net.citizensnpcs.api.npc.AbstractNPC.update(AbstractNPC.java:466) ~[?:?]
        at net.citizensnpcs.npc.CitizensNPC.update(CitizensNPC.java:345) ~[?:?]
        at net.citizensnpcs.nms.v1_16_R1.entity.EntityHumanNPC.tick(EntityHumanNPC.java:467) ~[?:?]
        at net.minecraft.server.v1_16_R1.WorldServer.entityJoinedWorld(WorldServer.java:659) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.World.a(World.java:753) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.WorldServer.doTick(WorldServer.java:394) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.MinecraftServer.b(MinecraftServer.java:1106) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.DedicatedServer.b(DedicatedServer.java:354) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.MinecraftServer.a(MinecraftServer.java:1009) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.MinecraftServer.v(MinecraftServer.java:848) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at net.minecraft.server.v1_16_R1.MinecraftServer.lambda$0(MinecraftServer.java:164) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        at java.lang.Thread.run(Unknown Source) [?:?]
Caused by: java.lang.NullPointerException
        at io.github.archy_x.aureliumskills.stats.Strength.onDamage(Strength.java:21) ~[?:?]
        at jdk.internal.reflect.GeneratedMethodAccessor455.invoke(Unknown Source) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:315) ~[spigot-1.16.1.jar:git-Spigot-0509002-6b95d59]
        ... 30 more