when I try to join my realm the screen that comes up after clicking on Minecraft realms has nothing on it and after about 2 minutes it says 'saving world' and closes Minecraft then tells me it crashed the notification has this code:

---- Minecraft Crash Report ----
// Hi. I'm Minecraft, and I'm a crashaholic.

Time: 23/06/20 17:14
Description: Rendering screen

java.lang.NullPointerException: Rendering screen
at nd.a(SourceFile:27)
at mr.b(SourceFile:109)
at mr.a(SourceFile:76)
at dmh.a(SourceFile:134)
at dmi.a(SourceFile:42)
at dmt.a(SourceFile:317)
at dmv.a(SourceFile:117)
at djv.a(SourceFile:67)
at ebs.a(SourceFile:603)
at dlx.e(SourceFile:1021)
at dlx.e(SourceFile:654)
at net.minecraft.client.main.Main.main(SourceFile:215)

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

– Head –
Thread: Render thread
Stacktrace:
at nd.a(SourceFile:27)
at mr.b(SourceFile:109)
at mr.a(SourceFile:76)
at dmh.a(SourceFile:134)
at dmi.a(SourceFile:42)
at dmt.a(SourceFile:317)
at dmv.a(SourceFile:117)
at djv.a(SourceFile:67)

– Screen render details –
Details:
Screen name: djv
Mouse location: Scaled: (281, 129). Absolute: (1968.000000, 906.000000)
Screen size: Scaled: (412, 258). Absolute: (2880, 1800). Scale factor of 7.000000
Stacktrace:
at ebs.a(SourceFile:603)
at dlx.e(SourceFile:1021)
at dlx.e(SourceFile:654)
at net.minecraft.client.main.Main.main(SourceFile:215)

– System Details –
Details:
Minecraft Version: 1.16
Minecraft Version ID: 1.16
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: 767734104 bytes (732 MB) / 2013265920 bytes (1920 MB) up to 2147483648 bytes (2048 MB)
CPUs: 12
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: 1.16
Backend library: LWJGL version 3.2.2 build 10
Backend API: Radeon Pro 555X GL version 4.6.13570 Compatibility Profile Context FireGL 19.30.01.33 26.20.13001.33012, ATI Technologies Inc.
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: vanilla
Current Language: English (US)
CPU: 12x Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz