[16:30:17 ERROR]: Could not pass event EntityDamageByEntityEvent to Shopkeepers v1.82
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:92) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:577) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:482) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:609) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.EntityLiving.damageEntity0(EntityLiving.java:1309) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.EntityLiving.damageEntity(EntityLiving.java:855) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.EntityMonster.damageEntity(EntityMonster.java:44) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.EntityHuman.attack(EntityHuman.java:1023) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.EntityPlayer.attack(EntityPlayer.java:1158) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1578) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:69) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.PacketPlayInUseEntity.a(SourceFile:13) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_144]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_144]
        at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [Towny.jar:git-Spigot-3fb9445-6e3cec8]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_144]
Caused by: java.lang.NullPointerException
        at com.nisovin.shopkeepers.pluginhandlers.CitizensHandler.getNPCId(CitizensHandler.java:117) ~[?:?]
        at com.nisovin.shopkeepers.ShopkeepersPlugin.getShopkeeperByEntity(ShopkeepersPlugin.java:662) ~[?:?]
        at com.nisovin.shopkeepers.ShopkeepersPlugin.isShopkeeper(ShopkeepersPlugin.java:679) ~[?:?]
        at com.nisovin.shopkeepers.LivingEntityShopListener.onEntityDamage(LivingEntityShopListener.java:86) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor262.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_144]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_144]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[Towny.jar:git-Spigot-3fb9445-6e3cec8]
        ... 24 more