org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.players.PlayerList.disconnect(PlayerList.java:496) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.network.PlayerConnection.a(PlayerConnection.java:1666) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.network.NetworkManager.handleDisconnection(NetworkManager.java:404) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.network.ServerConnection.c(ServerConnection.java:192) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:1336) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.dedicated.DedicatedServer.b(DedicatedServer.java:438) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:1217) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.MinecraftServer.x(MinecraftServer.java:1050) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at net.minecraft.server.MinecraftServer.lambda$0(MinecraftServer.java:305) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at java.lang.Thread.run(Thread.java:831) [?:?]
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make field private java.lang.Object java.lang.ref.Reference.referent accessible: module java.base does not "opens java.lang.ref" to unnamed module @58134517
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357) ~[?:?]
        at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297) ~[?:?]
        at java.lang.reflect.Field.checkCanSetAccessible(Field.java:177) ~[?:?]
        at java.lang.reflect.Field.setAccessible(Field.java:171) ~[?:?]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:157) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.MapTypeAdapterFactory.create(MapTypeAdapterFactory.java:126) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:115) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:164) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:100) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.getAdapter(Gson.java:423) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:56) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:125) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:243) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:69) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.write(ReflectiveTypeAdapterFactory.java:125) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.write(ReflectiveTypeAdapterFactory.java:243) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.toJson(Gson.java:669) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.toJson(Gson.java:648) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.toJson(Gson.java:603) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at com.google.gson.Gson.toJson(Gson.java:583) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        at me.zlaio.groups.events.PlayerQuitListener.onPlayerDisconnect(PlayerQuitListener.java:18) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:567) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.17.1.jar:3279-Spigot-3892929-2071671]
        ... 13 more