Whenever i go /stop or type stop in the console, this mess comes up

 

[15:22:10] [Server thread/INFO] [minecraft/MinecraftServer]: Stopping server
[15:22:10] [Server thread/INFO] [minecraft/MinecraftServer]: Saving players
[15:22:10] [Physics thread/WARN] [or.va.co.pi.VSPhysicsPipelineBackgroundTask/]: Physics pipeline ending
[15:22:10] [Server thread/ERROR] [minecraft/MinecraftServer]: Exception stopping the server
java.lang.NullPointerException: null
    at net.minecraft.network.play.ServerPlayNetHandler.handler$zbn000$onDisconnect(ServerPlayNetHandler.java:2625) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.lyonheart.json:ServerPlayNetHandlerMixin,pl:mixin:APP:valkyrienskies-common.mixins.json:feature.spawn_player_on_ship.MixinServerGamePacketListenerImpl,pl:mixin:APP:valkyrienskies-common.mixins.json:server.network.MixinServerGamePacketListenerImpl,pl:mixin:A}
    at net.minecraft.network.play.ServerPlayNetHandler.func_147231_a(ServerPlayNetHandler.java) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.lyonheart.json:ServerPlayNetHandlerMixin,pl:mixin:APP:valkyrienskies-common.mixins.json:feature.spawn_player_on_ship.MixinServerGamePacketListenerImpl,pl:mixin:APP:valkyrienskies-common.mixins.json:server.network.MixinServerGamePacketListenerImpl,pl:mixin:A}
    at net.minecraft.network.NetworkManager.func_179293_l(NetworkManager.java:366) ~[?:?] {re:classloading,pl:runtimedistcleaner:A,re:mixin,pl:runtimedistcleaner:A}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213167_f(SourceFile:79) ~[?:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
    at net.minecraft.network.play.ServerPlayNetHandler.func_194028_b(ServerPlayNetHandler.java:296) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:mixins.lyonheart.json:ServerPlayNetHandlerMixin,pl:mixin:APP:valkyrienskies-common.mixins.json:feature.spawn_player_on_ship.MixinServerGamePacketListenerImpl,pl:mixin:APP:valkyrienskies-common.mixins.json:server.network.MixinServerGamePacketListenerImpl,pl:mixin:A}
    at net.minecraft.server.management.PlayerList.func_72392_r(PlayerList.java:742) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:valkyrienskies-common.mixins.json:server.MixinPlayerList,pl:mixin:APP:create.mixins.json:PlayerListMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:557) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:valkyrienskies-common.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.dedicated.DedicatedServer.func_71260_j(DedicatedServer.java:514) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:679) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:valkyrienskies-common.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:valkyrienskies-common.mixins.json:server.MixinMinecraftServer,pl:mixin:A,pl:runtimedistcleaner:A}
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312] {}

Server info:
Modded 1.16.5
Forge 36.2.39
Mod List:
architectury
cloth
create
eureka
flywheel
jei
kotlin
lyonheart
sophisticated backpacks
worldedit
valkyrien skies
wings of freedom

should i worry? Thanks

 

A. 1.16.5 is no longer supported here. We only support 1.18.x and 1.19.x.

B. You do /stop and it stops, that's what you wanted, right?