---- Minecraft Crash Report ----
// Oops.

Time: 26/07/18 10:15
Description: Exception ticking world entities

java.lang.ArrayIndexOutOfBoundsException: -1
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet.fixPointers(ObjectLinkedOpenHashSet.java:851)
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet$SetIterator.remove(ObjectLinkedOpenHashSet.java:1057)
	at axu.l(SourceFile:1118)
	at tc.l(SourceFile:493)
	at net.minecraft.server.MinecraftServer.b(SourceFile:736)
	at net.minecraft.server.MinecraftServer.a(SourceFile:661)
	at dfz.a(SourceFile:158)
	at net.minecraft.server.MinecraftServer.run(SourceFile:564)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Server thread
Stacktrace:
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet.fixPointers(ObjectLinkedOpenHashSet.java:851)
	at it.unimi.dsi.fastutil.objects.ObjectLinkedOpenHashSet$SetIterator.remove(ObjectLinkedOpenHashSet.java:1057)
	at axu.l(SourceFile:1118)
	at tc.l(SourceFile:493)

-- Affected level --
Details:
	Level name: 18w30a World
	All players: 1 total; [te['KevinTheDruid'/425, l='18w30a World', x=-135.49, y=63.00, z=-228.34]]
	Chunk stats: ServerChunkCache: 667 Drop: 0
	Level seed: 7783051247262058537
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-60,63,-217), Chunk: (at 4,3,7 in -4,-14; contains blocks -64,0,-224 to -49,255,-209), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 7145 game time, 16877 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 126939 (now: false), thunder time: 71453 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:736)
	at net.minecraft.server.MinecraftServer.a(SourceFile:661)
	at dfz.a(SourceFile:158)
	at net.minecraft.server.MinecraftServer.run(SourceFile:564)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 18w30a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 286871776 bytes (273 MB) / 658825216 bytes (628 MB) up to 2134114304 bytes (2035 MB)
	JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UseConcMarkSweepGC -Xmn128M
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [te['KevinTheDruid'/425, l='18w30a World', x=-135.49, y=63.00, z=-228.34]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.