Sudo IndexOutOfBoundsException

[Trojaner]

[09:29:17] [Server thread/ERROR]: [SinkLibrary] Command "SinkCommands:sudo": Unexpected exception occurred:
[09:29:17] [Server thread/WARN]: java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
[09:29:17] [Server thread/WARN]: at java.util.ArrayList.rangeCheck(ArrayList.java:653)
[09:29:17] [Server thread/WARN]: at java.util.ArrayList.remove(ArrayList.java:492)
[09:29:17] [Server thread/WARN]: at de.static_interface.sinkcommands.command.SudoCommand.onExecute(SudoCommand.java:124)
[09:29:17] [Server thread/WARN]: at de.static_interface.sinklibrary.api.command.SinkCommandBase$1.execute(SinkCommandBase.java:290)
[09:29:17] [Server thread/WARN]: at de.static_interface.sinklibrary.api.command.SinkCommandBase.onCommand(SinkCommandBase.java:310)
[09:29:17] [Server thread/WARN]: at de.static_interface.sinklibrary.api.command.NativeCommand.execute(NativeCommand.java:121)
[09:29:17] [Server thread/WARN]: at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
[09:29:17] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641)
[09:29:17] [Server thread/WARN]: at com.ne0nx3r0.betteralias.alias.AliasManager$waitConsoleCommand.run(AliasManager.java:366)
[09:29:17] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
[09:29:17] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350)
[09:29:17] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723)
[09:29:17] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374)
[09:29:17] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654)
[09:29:17] [Server thread/WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557)
[09:29:17] [Server thread/WARN]: at java.lang.Thread.run(Thread.java:745)