> [15:07:07 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'is' in plugin ShardSkyblock v1.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[StellarSpigot4.jar:git-TacoSpigot-04511af6]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143) ~[StellarSpigot4.jar:git-TacoSpigot-04511af6]
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:660) ~[StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1280) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1089) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:820) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:840) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:759) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:660) [StellarSpigot4.jar:git-TacoSpigot-04511af6]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
at me.jwhz.core.command.commands.IslandCMD.onCommand(IslandCMD.java:158) ~[?:?]
at me.jwhz.core.command.CommandBase.onCommand(CommandBase.java:29) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[StellarSpigot4.jar:git-TacoSpigot-04511af6]
... 15 more