Minecraft crashes after 30 seconds or so after joining a multiplayer world

Minecraft Crash Report -------- Minecraft Crash Report ----// Sorry 😞
Time: 19-7-29 下午6:00Description: Unexpected error
java.lang.NullPointerException: Unexpected error at dnh.a(SourceFile:84) at dnc.a(SourceFile:754) at dnc.a(SourceFile:630) at cyc.e(SourceFile:954) at cyc.b(SourceFile:410) at net.minecraft.client.main.Main.main(SourceFile:155)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
– Head --Thread: Client threadStacktrace: at dnh.a(SourceFile:84) at dnc.a(SourceFile:754)
– Affected level --Details: All players: 0 total; [] Chunk stats: Client Chunk Cache: 5041, 0 Level dimension: minecraft:overworld Level name: MpServer 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: 0 game time, 0 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: ~_ERROR~ NullPointerException: null Server type: Non-integrated multiplayer serverStacktrace: at dkf.a(SourceFile:421) at cyc.b(SourceFile:1923) at cyc.b(SourceFile:430) at net.minecraft.client.main.Main.main(SourceFile:155)
– System Details --Details: Minecraft Version: 1.14.4 Minecraft Version ID: 1.14.4 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: 454877808 bytes (433 MB) / 654311424 bytes (624 MB) up to 838860800 bytes (800 MB) CPUs: 4 JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx800M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M Launched Version: 1.14.4 LWJGL: 3.2.2 build 10 OpenGL: Intel(R) HD Graphics 2000 GL version 3.1.0 - Build 9.17.10.4459, 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) CPU: 4x Intel(R) Core(TM) i5-2300 CPU @ 2.80GHz