Game crashed "whilst tesselating block model"

Whenever I try to enter my world, the game crashes, after loading and saving the said world. It happened just after the 19w45a update. It worked fine just a few hours before on the 19w44a version. And I have no idea on how to resolve this. plz hlp

Here's a copy of the crash report:

Minecraft Crash Report ----
// There are four lights!

Time: 8/11/19 10:47
Description: Tesselating block model

java.lang.NullPointerException: Tesselating block model
at dbs.a(SourceFile:39)
at dnb.a(SourceFile:761)
at dsr.a(SourceFile:129)
at dpt.a(SourceFile:14)
at dpt.a(SourceFile:18)
at dbr.k(SourceFile:48)
at dbr$$Lambda$1569/831473649.getColor(Unknown Source)
at dbr.a(SourceFile:112)
at dqw.a(SourceFile:141)
at dqw.a(SourceFile:127)
at dqw.b(SourceFile:76)
at dqw.a(SourceFile:47)
at dqu.a(SourceFile:60)
at dsq$c$b.a(SourceFile:510)
at dsq$c$b.a(SourceFile:432)
at dsq$c.k(SourceFile:397)
at dsq.a(SourceFile:179)
at dqe.a(SourceFile:898)
at dqe.a(SourceFile:1068)
at dqa.a(SourceFile:720)
at dqa.a(SourceFile:550)
at dbd.d(SourceFile:932)
at dbd.b(SourceFile:569)
at net.minecraft.client.main.Main.main(SourceFile:199)

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

– Head –
Thread: Render thread
Stacktrace:
at dbs.a(SourceFile:39)
at dnb.a(SourceFile:761)
at dsr.a(SourceFile:129)
at dpt.a(SourceFile:14)
at dpt.a(SourceFile:18)
at dbr.k(SourceFile:48)
at dbr$$Lambda$1569/831473649.getColor(Unknown Source)
at dbr.a(SourceFile:112)
at dqw.a(SourceFile:141)
at dqw.a(SourceFile:127)
at dqw.b(SourceFile:76)

– Block model being tesselated –
Details:
Block: Block{minecraft:grass_block}[snowy=false]
Block location: World: (10,64,0), Chunk: (at 10,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Using AO: true
Stacktrace:
at dqw.a(SourceFile:47)

– Block being tesselated –
Details:
Block: Block{minecraft:grass_block}[snowy=false]
Block location: World: (10,64,0), Chunk: (at 10,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
at dqu.a(SourceFile:60)
at dsq$c$b.a(SourceFile:510)
at dsq$c$b.a(SourceFile:432)
at dsq$c.k(SourceFile:397)
at dsq.a(SourceFile:179)
at dqe.a(SourceFile:898)
at dqe.a(SourceFile:1068)
at dqa.a(SourceFile:720)

– Affected level –
Details:
All players: 1 total; [dpo['Poloche_'/494, l='MpServer', x=5.50, y=71.00, z=9.83]]
Chunk stats: Client Chunk Cache: 1849, 658
Level dimension: minecraft:overworld
Level name: MpServer
Level seed: -1075736514393010890
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: {}
Level spawn location: World: (0,69,0), Chunk: (at 0,4,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 9448116 game time, 11705355 day time
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at dnb.a(SourceFile:442)
at dbd.c(SourceFile:1855)
at dbd.b(SourceFile:584)
at net.minecraft.client.main.Main.main(SourceFile:199)

– System Details –
Details:
Minecraft Version: 19w45a
Minecraft Version ID: 19w45a
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: 1589770520 bytes (1516 MB) / 2080374784 bytes (1984 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
Launched Version: 19w45a
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 1060 3GB/PCIe/SSE2 GL version 4.6.0 NVIDIA 431.07, NVIDIA Corporation
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs:
Current Language: English (US)
CPU: 4x Intel(R) Core(TM) i5-7600K CPU @ 3.80GHz