[12:37:14 INFO]: UUID of player kemmeo is 5fd50b69-fbb7-499c-823d-6f502162a616
[12:37:14 ERROR]: Could not pass event PlayerJoinEvent to AdvancedRanks v1.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:308) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot.jar:git-Spigot-30ef063-926ea10]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.PlayerList.onPlayerJoin(PlayerList.java:343) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.PlayerList.a(PlayerList.java:163) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.LoginListener.b(LoginListener.java:150) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.LoginListener.X_(LoginListener.java:54) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.NetworkManager.a(NetworkManager.java:231) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.ServerConnection.c(ServerConnection.java:120) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:945) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.DedicatedServer.w(DedicatedServer.java:411) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.MinecraftServer.v(MinecraftServer.java:780) [spigot.jar:git-Spigot-30ef063-926ea10]
        at net.minecraft.server.v1_13_R1.MinecraftServer.run(MinecraftServer.java:678) [spigot.jar:git-Spigot-30ef063-926ea10]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_171]
Caused by: java.lang.IllegalArgumentException: key
        at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        at org.bukkit.craftbukkit.v1_13_R1.CraftServer.getAdvancement(CraftServer.java:1778) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        at org.bukkit.Bukkit.getAdvancement(Bukkit.java:1138) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        at au.TheMrJezza.AdvancedRanks.Listeners.onPlayerJoin(Listeners.java:52) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_171]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_171]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_171]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_171]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304) ~[spigot.jar:git-Spigot-30ef063-926ea10]
        ... 14 more