Bukkit

[18:17:06] [Server thread/INFO]: Sfap issued server command: /helpopadmin history
[18:17:06] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'helpopadmin' in plugin SimpleHelpOp v1.1
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PlayerConnection.chat(PlayerConnection.java:1078) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.chat(CraftPlayer.java:237) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at it.mri.mycommand.execute.DispatchCommands.ExecuteCommands(DispatchCommands.java:635) [MyCommand.jar:?]
	at it.mri.mycommand.execute.DispatchCommands.PerformMycmdCommands(DispatchCommands.java:543) [MyCommand.jar:?]
	at it.mri.mycommand.execute.DispatchCommands.ExecuteMyCommandCommands(DispatchCommands.java:202) [MyCommand.jar:?]
	at it.mri.mycommand.listener.PreprocessEvent.onPlayerCommandPreprocess(PreprocessEvent.java:110) [MyCommand.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_66]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_66]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_66]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_66]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1154) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_66]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_66]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [Spigot.jar:git-Spigot-76236cb-62a2169]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
Caused by: java.lang.ArrayIndexOutOfBoundsException: -1
	at java.util.ArrayList.elementData(Unknown Source) ~[?:1.8.0_66]
	at java.util.ArrayList.get(Unknown Source) ~[?:1.8.0_66]
	at net.forsakencraft.SimpleHelpOp.SimpleHelpOp.onCommand(SimpleHelpOp.java:68) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Spigot.jar:git-Spigot-76236cb-62a2169]
	... 30 more