When I enter the nether, I'm instantly in the void and my player makes hurt sounds, then after a few seconds my game crashes. here's the crash text: 

Update: When I went to the nether I instantly changed my gamemode to spectator and seems like when I go to the nether for some weird reason I'm under the ground.

Time: 20.5.19 10.13
Description: Exception generating new chunk

java.lang.NullPointerException: Exception generating new chunk
at caa.a(SourceFile:221)
at cae.h(SourceFile:62)
at cae$$Lambda$1067/856000892.doWork(Unknown Source)
at cae$d.doWork(SourceFile:258)
at cae.a(SourceFile:214)
at wp.a(SourceFile:549)
at wp$$Lambda$2991/1930863457.apply(Unknown Source)
at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
at wp.a(SourceFile:543)
at wp$$Lambda$2988/1350948513.apply(Unknown Source)
at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)
at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
at wr.b(SourceFile:58)
at wr$$Lambda$2901/419804369.run(Unknown Source)
at aiv.e(SourceFile:83)
at aiv.a(SourceFile:123)
at aiv.run(SourceFile:91)
at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689)
at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

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

– Head –
Thread: Server thread
Stacktrace:
at caa.a(SourceFile:221)
at cae.h(SourceFile:62)
at cae$$Lambda$1067/856000892.doWork(Unknown Source)
at cae$d.doWork(SourceFile:258)
at cae.a(SourceFile:214)

– Chunk to be generated –
Details:
Location: 4,8
Position hash: 34359738372
Generator: cbx@7184a8cc
Stacktrace:
at wp.a(SourceFile:549)
at wp$$Lambda$2991/1930863457.apply(Unknown Source)
at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
at wp.a(SourceFile:543)
at wp$$Lambda$2988/1350948513.apply(Unknown Source)
at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)
at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
at wr.b(SourceFile:58)
at wr$$Lambda$2901/419804369.run(Unknown Source)
at aiv.e(SourceFile:83)
at aiv.a(SourceFile:123)
at aiv.run(SourceFile:91)

– Affected level –
Details:
All players: 1 total; [xe['King_Aziux'/253, l='yoo', x=-6.53, y=56.00, z=17.50]]
Chunk stats: ServerChunkCache: 1072
Level dimension: minecraft:the_nether
Derived: true
Level name: yoo
Level seed: -4445301971929824552
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options: {}
Level spawn location: World: (64,75,80), Chunk: (at 0,4,0 in 4,5; contains blocks 64,0,80 to 79,255,95), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 1790418 game time, 216743 day time
Known server brands: vanilla
Level was modded: false
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 102860 (now: false), thunder time: 61597 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.b(SourceFile:857)
at net.minecraft.server.MinecraftServer.a(SourceFile:793)
at edm.a(SourceFile:130)
at net.minecraft.server.MinecraftServer.run(SourceFile:655)
at java.lang.Thread.run(Thread.java:745)

– System Details –
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
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: 986122144 bytes (940 MB) / 2046820352 bytes (1952 MB) up to 2147483648 bytes (2048 MB)
CPUs: 4
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
Player Count: 1 / 8; [xe['King_Aziux'/253, l='yoo', x=-6.53, y=56.00, z=17.50]]
Data Packs: vanilla
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.