java.lang.IllegalArgumentException: Invalid UUID string: *someRegex*

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java.lang.IllegalArgumentException: Invalid UUID string: *someRegex*
at java.util.UUID.fromString(
at me.blackvein.quests.Quests.checkQuester(
at me.blackvein.quests.PlayerListener.onPlayerMove(
at sun.reflect.GeneratedMethodAccessor57.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
at java.lang.reflect.Method.invoke(
at org.bukkit.plugin.RegisteredListener.callEvent(
at org.bukkit.plugin.SimplePluginManager.fireEvent(
at org.bukkit.plugin.SimplePluginManager.callEvent(
at net.minecraft.server.v1_8_R1.PlayerConnection.a(
at net.minecraft.server.v1_8_R1.PacketPlayInFlying.a(SourceFile:126)
at net.minecraft.server.v1_8_R1.PacketPlayInPosition.a(SourceFile:57)
at java.util.concurrent.Executors$
at net.minecraft.server.v1_8_R1.MinecraftServer.z(
at net.minecraft.server.v1_8_R1.DedicatedServer.z(
at net.minecraft.server.v1_8_R1.MinecraftServer.y(

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