When someone join or switch world this errors show in console, the version is git-Paper-196 (MC: 1.20.1) and the plugin version is 2.3.9-SE-V1 premium.

[20:55:42 ERROR]: Could not pass event PlayerChangedWorldEvent to MythicalRaces v2.3.9-SE-V1
java.lang.NullPointerException: Cannot invoke "String.equalsIgnoreCase(String)" because the return value of "src.me.korbsti.mythicalraces.MythicalRaces.e()" is null
at src.me.korbsti.mythicalraces.events.h.a(Unknown Source) ~[MythicalRaces-2.3.9-SE-V1-out.jar:?]
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor934.execute(Unknown Source) ~[?:?]
at org.bukkit.plugin.EventExecutor$2.execute(EventExecutor.java:77) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:81) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:git-Paper-196]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
at io.papermc.paper.plugin.manager.PaperEventManager.callEvent(PaperEventManager.java:54) ~[paper-1.20.1.jar:git-Paper-196]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.callEvent(PaperPluginManagerImpl.java:126) ~[paper-1.20.1.jar:git-Paper-196]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:615) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
at net.minecraft.server.players.PlayerList.respawn(PlayerList.java:974) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.players.PlayerList.respawn(PlayerList.java:803) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.players.PlayerList.respawn(PlayerList.java:798) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.network.ServerGamePacketListenerImpl.handleClientCommand(ServerGamePacketListenerImpl.java:2978) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundClientCommandPacket.handle(ServerboundClientCommandPacket.java:24) ~[?:?]
at net.minecraft.network.protocol.game.ServerboundClientCommandPacket.a(ServerboundClientCommandPacket.java:10) ~[?:?]
at net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:51) ~[?:?]
at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1338) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:197) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1315) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1308) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1385) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1170) ~[paper-1.20.1.jar:git-Paper-196]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:317) ~[paper-1.20.1.jar:git-Paper-196]
at java.lang.Thread.run(Thread.java:833) ~[?:?]

I dont use github for support, please join our discord server

https://discord.gg/hc3s66CU

Did you edit the config in any way?