1.14 server crash: CraftBukkit/customDatapacks

---- Minecraft Crash Report ----
// There are four lights!

Time: 5/5/19 8:28 PM
Description: Ticking entity

java.lang.IllegalArgumentException: Name cannot be empty
	at org.apache.commons.lang.Validate.notEmpty(Validate.java:321)
	at org.bukkit.attribute.AttributeModifier.<init>(AttributeModifier.java:35)
	at org.bukkit.attribute.AttributeModifier.<init>(AttributeModifier.java:30)
	at org.bukkit.craftbukkit.v1_14_R1.attribute.CraftAttributeInstance.convert(CraftAttributeInstance.java:73)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftMetaItem.buildModifiers(CraftMetaItem.java:434)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftMetaItem.<init>(CraftMetaItem.java:363)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:507)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack.asBukkitCopy(CraftItemStack.java:62)
	at net.minecraft.server.v1_14_R1.Entity.a(Entity.java:1725)
	at net.minecraft.server.v1_14_R1.Entity.a(Entity.java:1713)
	at net.minecraft.server.v1_14_R1.LootTable.a(SourceFile:65)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItem.a(SourceFile:28)
	at net.minecraft.server.v1_14_R1.LootSelectorEntry$1.a(SourceFile:64)
	at net.minecraft.server.v1_14_R1.LootSelector.b(SourceFile:83)
	at net.minecraft.server.v1_14_R1.LootSelector.a(SourceFile:99)
	at net.minecraft.server.v1_14_R1.LootTable.populateLootDirect(SourceFile:75)
	at net.minecraft.server.v1_14_R1.LootTable.populateLoot(SourceFile:84)
	at net.minecraft.server.v1_14_R1.EntityLiving.a(EntityLiving.java:1372)
	at net.minecraft.server.v1_14_R1.EntityInsentient.a(EntityInsentient.java:458)
	at net.minecraft.server.v1_14_R1.EntityLiving.d(EntityLiving.java:1346)
	at net.minecraft.server.v1_14_R1.EntityLiving.die(EntityLiving.java:1306)
	at net.minecraft.server.v1_14_R1.EntityLiving.damageEntity(EntityLiving.java:1153)
	at net.minecraft.server.v1_14_R1.EntityMonster.damageEntity(SourceFile:71)
	at net.minecraft.server.v1_14_R1.Entity.burnFromLava(Entity.java:422)
	at net.minecraft.server.v1_14_R1.Entity.entityBaseTick(Entity.java:376)
	at net.minecraft.server.v1_14_R1.EntityLiving.entityBaseTick(EntityLiving.java:223)
	at net.minecraft.server.v1_14_R1.EntityInsentient.entityBaseTick(EntityInsentient.java:209)
	at net.minecraft.server.v1_14_R1.Entity.tick(Entity.java:327)
	at net.minecraft.server.v1_14_R1.EntityLiving.tick(EntityLiving.java:2200)
	at net.minecraft.server.v1_14_R1.EntityInsentient.tick(EntityInsentient.java:272)
	at net.minecraft.server.v1_14_R1.EntityMonster.tick(SourceFile:50)
	at net.minecraft.server.v1_14_R1.WorldServer.entityJoinedWorld(WorldServer.java:556)
	at net.minecraft.server.v1_14_R1.World.a(World.java:691)
	at net.minecraft.server.v1_14_R1.WorldServer.doTick(WorldServer.java:343)
	at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:995)
	at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:370)
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:909)
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:763)
	at java.lang.Thread.run(Thread.java:748)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Thread: Server thread
Stacktrace:
	at org.apache.commons.lang.Validate.notEmpty(Validate.java:321)
	at org.bukkit.attribute.AttributeModifier.<init>(AttributeModifier.java:35)
	at org.bukkit.attribute.AttributeModifier.<init>(AttributeModifier.java:30)
	at org.bukkit.craftbukkit.v1_14_R1.attribute.CraftAttributeInstance.convert(CraftAttributeInstance.java:73)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftMetaItem.buildModifiers(CraftMetaItem.java:434)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftMetaItem.<init>(CraftMetaItem.java:363)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack.getItemMeta(CraftItemStack.java:507)
	at org.bukkit.craftbukkit.v1_14_R1.inventory.CraftItemStack.asBukkitCopy(CraftItemStack.java:62)
	at net.minecraft.server.v1_14_R1.Entity.a(Entity.java:1725)
	at net.minecraft.server.v1_14_R1.Entity.a(Entity.java:1713)
	at net.minecraft.server.v1_14_R1.LootTable.a(SourceFile:65)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItemFunction.a(SourceFile:16)
	at net.minecraft.server.v1_14_R1.LootItem.a(SourceFile:28)
	at net.minecraft.server.v1_14_R1.LootSelectorEntry$1.a(SourceFile:64)
	at net.minecraft.server.v1_14_R1.LootSelector.b(SourceFile:83)
	at net.minecraft.server.v1_14_R1.LootSelector.a(SourceFile:99)
	at net.minecraft.server.v1_14_R1.LootTable.populateLootDirect(SourceFile:75)
	at net.minecraft.server.v1_14_R1.LootTable.populateLoot(SourceFile:84)
	at net.minecraft.server.v1_14_R1.EntityLiving.a(EntityLiving.java:1372)
	at net.minecraft.server.v1_14_R1.EntityInsentient.a(EntityInsentient.java:458)
	at net.minecraft.server.v1_14_R1.EntityLiving.d(EntityLiving.java:1346)
	at net.minecraft.server.v1_14_R1.EntityLiving.die(EntityLiving.java:1306)
	at net.minecraft.server.v1_14_R1.EntityLiving.damageEntity(EntityLiving.java:1153)
	at net.minecraft.server.v1_14_R1.EntityMonster.damageEntity(SourceFile:71)
	at net.minecraft.server.v1_14_R1.Entity.burnFromLava(Entity.java:422)
	at net.minecraft.server.v1_14_R1.Entity.entityBaseTick(Entity.java:376)
	at net.minecraft.server.v1_14_R1.EntityLiving.entityBaseTick(EntityLiving.java:223)
	at net.minecraft.server.v1_14_R1.EntityInsentient.entityBaseTick(EntityInsentient.java:209)
	at net.minecraft.server.v1_14_R1.Entity.tick(Entity.java:327)
	at net.minecraft.server.v1_14_R1.EntityLiving.tick(EntityLiving.java:2200)
	at net.minecraft.server.v1_14_R1.EntityInsentient.tick(EntityInsentient.java:272)
	at net.minecraft.server.v1_14_R1.EntityMonster.tick(SourceFile:50)
	at net.minecraft.server.v1_14_R1.WorldServer.entityJoinedWorld(WorldServer.java:556)

-- Entity being ticked --
Details:
	Entity Type: minecraft:skeleton (net.minecraft.server.v1_14_R1.EntitySkeleton)
	Entity ID: 55967
	Entity Name: Skeleton
	Entity's Exact location: -2397.70, 17.00, 266.98
	Entity's Block location: World: (-2398,17,266), Chunk: (at 2,1,10 in -150,16; contains blocks -2400,0,256 to -2385,255,271), Region: (-5,0; contains chunks -160,0 to -129,31, blocks -2560,0,0 to -2049,255,511)
	Entity's Momentum: 0.00, -0.02, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at net.minecraft.server.v1_14_R1.World.a(World.java:691)
	at net.minecraft.server.v1_14_R1.WorldServer.doTick(WorldServer.java:343)

-- Affected level --
Details:
	Level name: world
	All players: 2 total; [EntityPlayer['panshrexual'/155, l='world', x=-2442.50, y=66.00, z=223.50](panshrexual at -2442.5,66.0,223.5), EntityPlayer['Momibelle'/4588, l='world', x=-2434.43, y=29.00, z=191.15](Momibelle at -2434.4277957001664,29.0,191.15049417554005)]
	Chunk stats: ServerChunkCache: 4140
	Level seed: 8885681254330917499
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (4990,80,-3208), Chunk: (at 14,5,8 in 311,-201; contains blocks 4976,0,-3216 to 4991,255,-3201), Region: (9,-7; contains chunks 288,-224 to 319,-193, blocks 4608,0,-3584 to 5119,255,-3073)
	Level time: 306154618 game time, 19508 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 103920 (now: false), thunder time: 90857 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:995)
	at net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:370)
	at net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:909)
	at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:763)
	at java.lang.Thread.run(Thread.java:748)

-- System Details --
Details:
	Minecraft Version: 1.14
	Operating System: Linux (amd64) version 3.8.0-44-generic
	Java Version: 1.8.0_202, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 206013768 bytes (196 MB) / 2326790144 bytes (2219 MB) up to 3817865216 bytes (3641 MB)
	JVM Flags: 2 total; -Xmx4096M -Xms512M
	CraftBukkit Information:
   Running: CraftBukkit version git-Bukkit-5193f76 (MC: 1.14) (Implementing API version 1.14-R0.1-SNAPSHOT) true
   Plugins: {}
   Warnings: DEFAULT
   Reload Count: 0
   Threads: { TIMED_WAITING ObjectCleanerThread: [java.lang.Object.wait(Native Method), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144), io.netty.util.internal.ObjectCleaner$1.run(ObjectCleaner.java:54), io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #11: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #6: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], WAITING Java2D Disposer: [java.lang.Object.wait(Native Method), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165), sun.java2d.Disposer.run(Disposer.java:148), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #4: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE DestroyJavaVM: [], WAITING Reference Handler: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:502), java.lang.ref.Reference.tryHandlePending(Reference.java:191), java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)], RUNNABLE Netty Epoll Server IO #8: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Server console handler: [java.io.FileInputStream.readBytes(Native Method), java.io.FileInputStream.read(FileInputStream.java:255), java.io.BufferedInputStream.fill(BufferedInputStream.java:246), java.io.BufferedInputStream.read(BufferedInputStream.java:265), org.bukkit.craftbukkit.libs.jline.internal.NonBlockingInputStream.read(NonBlockingInputStream.java:248), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:261), org.bukkit.craftbukkit.libs.jline.internal.InputStreamReader.read(InputStreamReader.java:198), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readCharacter(ConsoleReader.java:2145), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLineSimple(ConsoleReader.java:3183), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2333), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2269), org.bukkit.craftbukkit.libs.jline.console.ConsoleReader.readLine(ConsoleReader.java:2257), net.minecraft.server.v1_14_R1.DedicatedServer$2.run(DedicatedServer.java:96)], RUNNABLE Netty Epoll Server IO #5: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], WAITING Thread-3: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.park(LockSupport.java:175), java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039), java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442), com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77), org.bukkit.craftbukkit.v1_14_R1.util.TerminalConsoleWriterThread.run(TerminalConsoleWriterThread.java:30)], RUNNABLE Netty Epoll Server IO #2: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #10: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #1: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #3: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #7: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], WAITING Snooper Timer: [java.lang.Object.wait(Native Method), java.lang.Object.wait(Object.java:502), java.util.TimerThread.mainLoop(Timer.java:526), java.util.TimerThread.run(Timer.java:505)], RUNNABLE Signal Dispatcher: [], WAITING Resource IO {0}: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.locks.LockSupport.park(LockSupport.java:175), java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039), java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442), java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1074), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624), java.lang.Thread.run(Thread.java:748)], TIMED_WAITING Server Infinisleeper: [java.lang.Thread.sleep(Native Method), net.minecraft.server.v1_14_R1.DedicatedServer$1.run(DedicatedServer.java:68)], RUNNABLE Netty Epoll Server IO #0: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], RUNNABLE Netty Epoll Server IO #9: [io.netty.channel.epoll.Native.epollWait0(Native Method), io.netty.channel.epoll.Native.epollWait(Native.java:114), io.netty.channel.epoll.EpollEventLoop.epollWait(EpollEventLoop.java:239), io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:256), io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884), java.lang.Thread.run(Thread.java:748)], TIMED_WAITING Server-Worker-31: [sun.misc.Unsafe.park(Native Method), java.util.concurrent.ForkJoinPool.awaitWork(ForkJoinPool.java:1824), java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1693), java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)], RUNNABLE Server thread: [java.lang.Thread.dumpThreads(Native Method), java.lang.Thread.getAllStackTraces(Thread.java:1610), org.bukkit.craftbukkit.v1_14_R1.CraftCrashReport.call(CraftCrashReport.java:30), net.minecraft.server.v1_14_R1.CrashReportSystemDetails.a(SourceFile:79), net.minecraft.server.v1_14_R1.CrashReport.h(CrashReport.java:67), net.minecraft.server.v1_14_R1.CrashReport.<init>(CrashReport.java:35), net.minecraft.server.v1_14_R1.CrashReport.a(CrashReport.java:265), net.minecraft.server.v1_14_R1.World.a(World.java:693), net.minecraft.server.v1_14_R1.WorldServer.doTick(WorldServer.java:343), net.minecraft.server.v1_14_R1.MinecraftServer.b(MinecraftServer.java:995), net.minecraft.server.v1_14_R1.DedicatedServer.b(DedicatedServer.java:370), net.minecraft.server.v1_14_R1.MinecraftServer.a(MinecraftServer.java:909), net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:763), java.lang.Thread.run(Thread.java:748)], WAITING Finalizer: [java.lang.Object.wait(Native Method), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144), java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:165), java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:216)],}
   Recent tasks from 7819-7849{}
	Player Count: 2 / 80; [EntityPlayer['panshrexual'/155, l='world', x=-2442.50, y=66.00, z=223.50](panshrexual at -2442.5,66.0,223.5), EntityPlayer['Momibelle'/4588, l='world', x=-2434.43, y=29.00, z=191.15](Momibelle at -2434.4277957001664,29.0,191.15049417554005)]
	Data Packs: vanilla, file/bukkit (incompatible), file/RoguelikeSystem
	Is Modded: Definitely; Server brand changed to 'CraftBukkit'
	Type: Dedicated Server (map_server.txt)