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java.lang.IllegalArgumentException: Invalid UUID string:	at java.util.UUID.fromString(Unknown Source)	at me.Yekllurt.Guilds.MySQL.Guild.isInAnyGuild(Guild.java:102)	at me.Yekllurt.Guilds.Move.onJoin(Move.java:23)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at net.minecraft.server.v1_8_R3.PlayerList.onPlayerJoin(PlayerList.java:296)	at net.minecraft.server.v1_8_R3.PlayerList.a(PlayerList.java:156)	at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:144)	at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54)	at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231)	at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148)	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:817)	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367)	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657)	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560)	at java.lang.Thread.run(Unknown Source)