[ERROR] Current Thread: Server thread

[ERROR] PID: 17 | Suspended: false | Native: false | State: RUNNABLE

[ERROR] Stack:

[ERROR] com.songoda.ultimatestacker.entity.EntityStack.getMetadata(EntityStack.java:197)

[ERROR] com.songoda.ultimatestacker.entity.EntityStack.handleSingleStackDeath(EntityStack.java:160)

[ERROR] com.songoda.ultimatestacker.entity.EntityStack.onDeath(EntityStack.java:241)

[ERROR] com.songoda.ultimatestacker.listeners.DeathListeners.onEntityDeath(DeathListeners.java:62)

[ERROR] com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor1064.execute(Unknown Source)

[ERROR] org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:70)

[ERROR] co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78)

[ERROR] org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)

[ERROR] org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:513)

[ERROR] org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:397)

[ERROR] net.minecraft.server.v1_12_R1.EntityLiving.die(EntityLiving.java:1148)

[ERROR] net.minecraft.server.v1_12_R1.EntityLiving.damageEntity(EntityLiving.java:983)

[ERROR] net.minecraft.server.v1_12_R1.Entity.burnFromLava(Entity.java:530)

[ERROR] net.minecraft.server.v1_12_R1.Entity.Y(Entity.java:483)

[ERROR] net.minecraft.server.v1_12_R1.EntityLiving.Y(EntityLiving.java:207)

[ERROR] net.minecraft.server.v1_12_R1.EntityInsentient.Y(EntityInsentient.java:187)

[ERROR] net.minecraft.server.v1_12_R1.Entity.B_(Entity.java:356)

[ERROR] net.minecraft.server.v1_12_R1.EntityLiving.B_(EntityLiving.java:1945)

[ERROR] net.minecraft.server.v1_12_R1.EntityInsentient.B_(EntityInsentient.java:247)

[ERROR] net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1797)

[ERROR] net.minecraft.server.v1_12_R1.World.h(World.java:1767)

[ERROR] net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1574)

[ERROR] net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:682)

[ERROR] net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:921)

[ERROR] net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:423)

[ERROR] net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:774)

[ERROR] net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:666)

[ERROR] java.lang.Thread.run(Thread.java:748)