---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 1/3/18 10:57 PM
Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at hk.hashCode(SourceFile:121)
	at java.util.HashMap.hash(HashMap.java:338)
	at java.util.HashMap.remove(HashMap.java:798)
	at bjy.a(SourceFile:143)
	at rr.a(SourceFile:168)
	at rk.a(SourceFile:202)
	at net.minecraft.server.MinecraftServer.w(SourceFile:687)
	at net.minecraft.server.MinecraftServer.v(SourceFile:604)
	at cmd.v(SourceFile:152)
	at net.minecraft.server.MinecraftServer.run(SourceFile:509)
	at java.lang.Thread.run(Thread.java:745)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 18w01a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 228546800 bytes (217 MB) / 570425344 bytes (544 MB) up to 1073741824 bytes (1024 MB)
	JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [rp['TextComponent{text='GrassPelt', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}'/584, l='HG Medival AOE map Update', x=484.17, y=74.00, z=-479.76]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.