[21:31:05 ERROR]: Could not pass event EntityDamageByEntityEvent to MobHunting v
6.6.4
org.bukkit.event.EventException: null
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:316) ~[spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:66) ~[spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:507) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:492) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callEvent(Cra
ftEventFactory.java:102) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callEntityDam
ageEvent(CraftEventFactory.java:762) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fd
bc]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.handleEntityD
amageEvent(CraftEventFactory.java:661) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46
fdbc]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.handleLivingE
ntityDamageEvent(CraftEventFactory.java:794) [spigot-1.13.2.jar:git-Spigot-1a350
4a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityLiving.damageEntity0(EntityLiving
.java:1445) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityHuman.damageEntity0(EntityHuman.j
ava:879) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityLiving.damageEntity(EntityLiving.
java:967) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityHuman.damageEntity(EntityHuman.ja
va:792) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityPlayer.damageEntity(EntityPlayer.
java:625) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.citizensnpcs.nms.v1_13_R2.entity.EntityHumanNPC.damageEntity(Enti
tyHumanNPC.java:151) [Citizens-2.0.25-b1702.jar:?]
at net.minecraft.server.v1_13_R2.EntityInsentient.B(EntityInsentient.jav
a:1221) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityPhantom$i.e(EntityPhantom.java:28
5) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.PathfinderGoalSelector.doTick(SourceFil
e:129) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityInsentient.doTick(EntityInsentien
t.java:659) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityLiving.movementTick(EntityLiving.
java:2254) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityInsentient.movementTick(EntityIns
entient.java:510) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityPhantom.movementTick(EntityPhanto
m.java:110) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityLiving.tick(EntityLiving.java:209
8) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityInsentient.tick(EntityInsentient.
java:248) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
at net.minecraft.server.v1_13_R2.EntityPhantom.tick(EntityPhantom.java:8

1. [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.World.entityJoinedWorld(World.java:1331
   ) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.World.g(World.java:1298) [spigot-1.13.2
   .jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.World.tickEntities(World.java:1132) [sp
   igot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.WorldServer.tickEntities(WorldServer.ja
   va:583) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:
2. [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:
3. [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:
4. [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.jav
   a:729) [spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   at java.lang.Thread.run(Unknown Source) [?:1.8.0_201]
   Caused by: java.lang.NoSuchFieldError: hSpawnedHorses
   at one.lindegaard.MobHunting.compatibility.McMMOHorses.isMcMMOHorse(McMM
   OHorses.java:60) ~[?:?]
   at one.lindegaard.MobHunting.MobHuntingManager.onMobDamage(MobHuntingMan
   ager.java:491) ~[?:?]
   at sun.reflect.GeneratedMethodAccessor454.invoke(Unknown Source) ~[?:?]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
   .8.0_201]
   at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_201]
   at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
   va:312) ~[spigot-1.13.2.jar:git-Spigot-1a3504a-a46fdbc]
   ... 32 more
   [21:31:15 INFO]: Unhandled moon phase.

An infernal phantom attacked an NPC....... that has npc_police and npc_destinations on it with sentinel

Make sure that you have updated Mcmmohorses

hSpawnedHorses
at one.lindegaard.MobHunting.compatibility.McMMOHorses.isMcMMOHorse(McMM
OHorses.java:60) ~[?:?]
at

version 4.3.55, and this is the latest..... (mcMMOHorse plugin ofcourse)

Don't worry about it too much, it still works and we (I for sure) know that you will take care of your plugin.

It seems that one of the newest versions of McMMOHorses broke the compatibility. I have updated to McMMOHorses V4.3.55 in next release. You will need to upgrade to this version or newer.