Fatal MC error

[12Apr2021 00:43:30.215] [Server thread/FATAL] [net.minecraft.util.concurrent.ThreadTaskExecutor/]: Error executing task on Server
java.lang.NullPointerException: null
    at net.minecraft.world.server.TicketManager.func_219367_b(TicketManager.java:227) ~[?:?]
    at net.minecraft.world.server.ChunkManager.func_219183_a(ChunkManager.java:879) ~[?:?]
    at net.minecraft.world.server.ServerChunkProvider.func_217221_a(ServerChunkProvider.java:445) ~[?:?]
    at net.minecraft.network.play.ServerPlayNetHandler.func_147347_a(ServerPlayNetHandler.java:845) ~[?:?]
    at net.minecraft.network.play.client.CPlayerPacket.func_148833_a(SourceFile:122) ~[?:?]
    at net.minecraft.network.play.client.CPlayerPacket$PositionRotationPacket.func_148833_a(SourceFile:18) ~[?:?]
    at net.minecraft.network.PacketThreadUtil.func_225383_a(SourceFile:21) ~[?:?]
    at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?]
    at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:734) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:159) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:717) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:711) ~[?:?]
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213160_bf(SourceFile:103) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:696) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:646) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?]
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_281]