Featherboard CombatHook error

[08:18:29] [Server thread/INFO]: Could not get shooter
[08:18:29] [Server thread/ERROR]: Could not pass event EntityDamageByEntityEvent to FeatherBoard v4.9.0
org.bukkit.event.EventException
	at org.bukkit.plugin.EventExecutor$1.execute(EventExecutor.java:46) ~[paperclip.jar:git-Paper-1104]
	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[paperclip.jar:git-Paper-1104]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[paperclip.jar:git-Paper-1104]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [paperclip.jar:git-Paper-1104]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) [paperclip.jar:git-Paper-1104]
	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:93) [paperclip.jar:git-Paper-1104]
	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:578) [paperclip.jar:git-Paper-1104]
	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:483) [paperclip.jar:git-Paper-1104]
	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:610) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.EntityLiving.damageEntity0(EntityLiving.java:1330) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.EntityLiving.damageEntity(EntityLiving.java:872) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.EntityEgg.a(EntityEgg.java:30) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.EntityProjectile.A_(EntityProjectile.java:176) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.World.entityJoinedWorld(World.java:1740) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.World.h(World.java:1715) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.World.tickEntities(World.java:1532) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.WorldServer.tickEntities(WorldServer.java:621) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:907) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:403) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:763) [paperclip.jar:git-Paper-1104]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:661) [paperclip.jar:git-Paper-1104]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_11_R1.projectiles.CraftBlockProjectileSource cannot be cast to org.bukkit.entity.Entity
	at be.maximvdw.placeholdercore.placeholders.eventhooks.VanillaCombatHook.onAttack(VanillaCombatHook.java:245) ~[?:?]
	at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor361.execute(Unknown Source) ~[?:?]
	at org.bukkit.plugin.EventExecutor$1.execute(EventExecutor.java:44) ~[paperclip.jar:git-Paper-1104]
	... 21 more