I cant join a Server that Supports 1.13 Ect. in 1.13 and 1.13.1 when its about to Join the server it says Saving world and crashes it says Unexpected error Blah blah blah I hit the Show more details button it says The game crashed whilst unexpected error
Error: java.lang.NullPointerException: Unexpected error and show more details says this 

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 9/20/18 5:44 PM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at cfh.a(SourceFile:60)
at cfh.a(SourceFile:72)
at ctw.a(SourceFile:59)
at ctx.b(SourceFile:889)
at ctx.a(SourceFile:875)
at ctx.a(SourceFile:749)
at cfs.c(SourceFile:850)
at cfs.a(SourceFile:395)
at net.minecraft.client.main.Main.main(SourceFile:144)

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

– Head –
Thread: Client thread
Stacktrace:
at cfh.a(SourceFile:60)
at cfh.a(SourceFile:72)
at ctw.a(SourceFile:59)
at ctx.b(SourceFile:889)
at ctx.a(SourceFile:875)

– Affected level –
Details:
Level name: MpServer
All players: 0 total; []
Chunk stats: MultiplayerChunkCache: 121, 121
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options: {}
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 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: 24640859 game time, 23000000 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: adventure (ID 2). Hardcore: false. Cheats: false
Forced entities: 0 total; []
Retry entities: 0 total; []
Server brand: ~_ERROR~ NullPointerException: null
Server type: Non-integrated multiplayer server
Stacktrace:
at crf.a(SourceFile:418)
at cfs.b(SourceFile:1815)
at cfs.a(SourceFile:408)
at net.minecraft.client.main.Main.main(SourceFile:144)

– System Details –
Details:
Minecraft Version: 1.13.1
Operating System: Windows 10 (x86) version 10.0
Java Version: 1.8.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 379840160 bytes (362 MB) / 704643072 bytes (672 MB) up to 1073741824 bytes (1024 MB)
JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
Launched Version: 1.13.1
LWJGL: 3.1.6 build 14
OpenGL: Intel(R) HD Graphics 400 GL version 4.4.0 - Build 20.19.15.4352, 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:
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Atom(TM) x5-Z8350 CPU @ 1.44GHz