Game keeps crashing while trying to load world. Happened when went into gamemode 3.

Crash report:

---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 13.1.2019 0:03
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at cqo.a(SourceFile:406)
at cqo.c(SourceFile:363)
at cqo.a(SourceFile:188)
at deu.a(SourceFile:777)
at cpz.d(SourceFile:929)
at cpz.b(SourceFile:405)
at net.minecraft.client.main.Main.main(SourceFile:154)

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

– Head –
Thread: Client thread
Stacktrace:
at cqo.a(SourceFile:406)
at cqo.c(SourceFile:363)
at cqo.a(SourceFile:188)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [deh['TheMineGuy2'/103, l='MpServer', x=-104.53, y=66.70, z=-578.45]]
Chunk stats: MultiplayerChunkCache: 289, 5
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: {}
Level spawn location: World: (-96,64,0), Chunk: (at 0,4,0 in -6,0; contains blocks -96,0,0 to -81,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 308593 game time, 6000 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: spectator (ID 3). Hardcore: false. Cheats: false
Forced entities: 1 total; [deh['TheMineGuy2'/103, l='MpServer', x=-104.53, y=66.70, z=-578.45]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at dcc.a(SourceFile:367)
at cpz.b(SourceFile:1947)
at cpz.b(SourceFile:418)
at net.minecraft.client.main.Main.main(SourceFile:154)

– System Details –
Details:
Minecraft Version: 19w02a
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: 902509384 bytes (860 MB) / 1946157056 bytes (1856 MB) up to 2147483648 bytes (2048 MB)
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
Launched Version: 19w02a
LWJGL: 3.1.6 build 14
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4252, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: vanilla
Current Language: English (United Kingdom)
CPU: 4x Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz