All commands should be checked again for something like this

org.bukkit.command.CommandException: Unhandled exception executing command 'gate' in plugin Craft Inc. Gates v2.2.0-dev
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
at org.bukkit.craftbukkit.v1_4_R1.CraftServer.dispatchCommand(CraftServer.java:514)
at net.minecraft.server.v1_4_R1.PlayerConnection.handleCommand(PlayerConnection.java:980)
at net.minecraft.server.v1_4_R1.PlayerConnection.chat(PlayerConnection.java:898)
at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java:853)
at net.minecraft.server.v1_4_R1.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_4_R1.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.v1_4_R1.PlayerConnection.d(PlayerConnection.java:113)
at net.minecraft.server.v1_4_R1.ServerConnection.b(SourceFile:39)
at net.minecraft.server.v1_4_R1.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:598)
at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.get(ArrayList.java:382)
at de.craftinc.gates.commands.BaseCommand.validateCall(BaseCommand.java:108)
at de.craftinc.gates.commands.BaseCommand.execute(BaseCommand.java:45)
at de.craftinc.gates.Plugin.handleCommand(Plugin.java:180)
at de.craftinc.gates.Plugin.onCommand(Plugin.java:160)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
... 15 more