Dość nietypowy błąd

Witam

Napisałem oto taki skrypt:

on connect:	if name of player contains "`" or "~":		log "Gracz [%player%] o adresie ip [%IP of player%] o uuid [%UUID of player%]" to "logi_zakazanych.txt"		kick player due to "Niedozwolony nick"		stop

Gdy weszłem na serwer z nikiem który zawierał "~"

To nie zkikowało mnie ale wywaliło błąd w konsoli.

[23:17:20] [User Authenticator #4/INFO]: UUID of player edd! is 4d3b60dc-c5f9-32bf-bc3e-7458d6c897c3[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! [Skript] Severe Error:[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! If you're developing an add-on for Skript this likely means that you have done something wrong.[23:17:20] [Server thread/ERROR]: #!#! If you're a server admin however please go to http://dev.bukkit.org/server-mods/skript/tickets/[23:17:20] [Server thread/ERROR]: #!#! and check whether this error has already been reported.[23:17:20] [Server thread/ERROR]: #!#! If not please create a new ticket with a meaningful title, copy & paste this whole error into it,[23:17:20] [Server thread/ERROR]: #!#! and describe what you did before it happened and/or what you think caused the error.[23:17:20] [Server thread/ERROR]: #!#! If you think that it's a trigger that's causing the error please post the trigger as well.[23:17:20] [Server thread/ERROR]: #!#! By following this guide fixing the error should be easy and done fast.[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! Stack trace:[23:17:20] [Server thread/ERROR]: #!#! java.lang.NullPointerException[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.expressions.ExprIP.convert(ExprIP.java:52)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.expressions.ExprIP.convert(ExprIP.java:1)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.registrations.Converters.convert(Converters.java:302)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.registrations.Converters.convertUnsafe(Converters.java:294)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.expressions.base.PropertyExpression.get(PropertyExpression.java:105)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.expressions.base.SimplePropertyExpression.get(SimplePropertyExpression.java:56)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.expressions.base.PropertyExpression.get(PropertyExpression.java:76)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.util.SimpleExpression.getArray(SimpleExpression.java:101)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.VariableString.toString(VariableString.java:390)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.VariableString.getArray(VariableString.java:495)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.VariableString.getArray(VariableString.java:1)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.effects.EffLog.execute(EffLog.java:93)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.Effect.run(Effect.java:50)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:63)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:91)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.lang.Trigger.execute(Trigger.java:53)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.SkriptEventHandler.check(SkriptEventHandler.java:149)[23:17:20] [Server thread/ERROR]: #!#! at ch.njol.skript.SkriptEventHandler$1.execute(SkriptEventHandler.java:109)[23:17:20] [Server thread/ERROR]: #!#! at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)[23:17:20] [Server thread/ERROR]: #!#! at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)[23:17:20] [Server thread/ERROR]: #!#! at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.PlayerList.attemptLogin(PlayerList.java:414)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.LoginListener.b(LoginListener.java:97)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.LoginListener.c(LoginListener.java:41)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.NetworkManager.a(NetworkManager.java:159)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.ServerConnection.c(ServerConnection.java:82)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:785)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623)[23:17:20] [Server thread/ERROR]: #!#! at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526)[23:17:20] [Server thread/ERROR]: #!#! at java.lang.Thread.run(Thread.java:745)[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! Version Information:[23:17:20] [Server thread/ERROR]: #!#! Skript: 2.1.2[23:17:20] [Server thread/ERROR]: #!#! Bukkit: 1.8-R0.1-SNAPSHOT[23:17:20] [Server thread/ERROR]: #!#! Minecraft: 1.8[23:17:20] [Server thread/ERROR]: #!#! Java: 1.7.0_79[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! Running CraftBukkit: false[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! Current node: null[23:17:20] [Server thread/ERROR]: #!#! Current item: log "Gracz [%the player%] o adresie ip [%the IP address of the player%] o uuid [%the UUID of the player%]" to "logi_zakazanych.txt"[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! Thread: Server thread[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/ERROR]: #!#! End of Error.[23:17:20] [Server thread/ERROR]: #!#![23:17:20] [Server thread/INFO]: edd![/31.42.10.217:52997] logged in with entity id 170399 at ([world] -4.5, 92.0, -8.5)

Ale gdy wejdę z normalnym nikiem nie zawierającym "~" lub "`" to wszystko działa.

Co może być przyczyną? Chciałem zabezpieczyć mój serwer przed nikami zawierającymi takie znaki bo słyszałem że wtedy można łatwiej go zkraszować