Crash in swamp

After a certain period of random time near a swamp a Java exception occurs and the client crashes without notice, in my example it happens twice and purely when in a swamp near my spawn.

---- Minecraft Crash Report ----
// Would you like a cupcake?Time: 5/24/18 4:19 PM
Description: Exception ticking world

java.lang.NullPointerException: Exception ticking world
	at bwi.a(SourceFile:186)
	at bwi.a(SourceFile:92)
	at bwm.d(SourceFile:60)
	at brt.a(SourceFile:298)
	at sj.a(SourceFile:307)
	at sk.a(SourceFile:249)
	at bbo.a(SourceFile:144)
	at sk.i_(SourceFile:199)
	at net.minecraft.server.MinecraftServer.w(SourceFile:694)
	at net.minecraft.server.MinecraftServer.v(SourceFile:627)
	at dii.v(SourceFile:156)
	at net.minecraft.server.MinecraftServer.run(SourceFile:532)
	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 bwi.a(SourceFile:186)
	at bwi.a(SourceFile:92)
	at bwm.d(SourceFile:60)
	at brt.a(SourceFile:298)
	at sj.a(SourceFile:307)
	at sk.a(SourceFile:249)
	at bbo.a(SourceFile:144)
	at sk.i_(SourceFile:199)-- Affected level --
Details:
	Level name: Phoenix Memories
	All players: 1 total; [sm['RaphaniacZX'/320, l='Phoenix Memories', x=-369.91, y=65.00, z=-238.03]]
	Chunk stats: ServerChunkCache: 472 Drop: 0
	Level seed: 5700850095545515784
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: null
	Level spawn location: World: (-200,63,-69), Chunk: (at 8,3,11 in -13,-5; contains blocks -208,0,-80 to -193,255,-65), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 190922 game time, 226123 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 74260 (now: false), thunder time: 101490 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.w(SourceFile:694)
	at net.minecraft.server.MinecraftServer.v(SourceFile:627)
	at dii.v(SourceFile:156)
	at net.minecraft.server.MinecraftServer.run(SourceFile:532)
	at java.lang.Thread.run(Thread.java:745)-- System Details --
Details:
	Minecraft Version: 18w21a
	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: 408035208 bytes (389 MB) / 973078528 bytes (928 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
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [sm['RaphaniacZX'/320, l='Phoenix Memories', x=-369.91, y=65.00, z=-238.03]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.