EggCatcher Snowgolem error

> [19:04:14 ERROR]: Could not pass event EntityDamageByEntityEvent to EggCatcher v4.2
org.bukkit.event.EventException: null
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:72) ~[patched_1.13.2.jar:git-Paper-492]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callEvent(CraftEventFactory.java:103) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:829) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:728) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.craftbukkit.v1_13_R2.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:861) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.EntityLiving.damageEntity0(EntityLiving.java:1520) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.EntityLiving.damageEntity(EntityLiving.java:993) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.EntityEgg.a(EntityEgg.java:26) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.EntityProjectile.tick(EntityProjectile.java:160) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.World.entityJoinedWorld(World.java:1549) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.World.g(World.java:1516) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.World.tickEntities(World.java:1323) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.WorldServer.tickEntities(WorldServer.java:598) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1098) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:937) ~[patched_1.13.2.jar:git-Paper-492]
at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:835) ~[patched_1.13.2.jar:git-Paper-492]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_192]
Caused by: java.lang.IllegalArgumentException: Material cannot be null
at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:73) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:61) ~[patched_1.13.2.jar:git-Paper-492]
at org.bukkit.inventory.ItemStack.<init>(ItemStack.java:49) ~[patched_1.13.2.jar:git-Paper-492]
at me.shansen.EggCatcher.listeners.EggCatcherEntityListener.onEntityHitByEgg(EggCatcherEntityListener.java:262) ~[?:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor217.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70) ~[patched_1.13.2.jar:git-Paper-492]
... 20 more