org.bukkit.command.CommandException: Unhandled exception executing command 'island' in plugin SkyBlock vv0.1 ALPHA
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at org.bukkit.craftbukkit.v1_15_R1.CraftServer.dispatchCommand(CraftServer.java:723) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.PlayerConnection.handleCommand(PlayerConnection.java:1658) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1498) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:47) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:918) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:911) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:895) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:828) [spigot.jar:git-Spigot-a03b1fd-95bd423]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
Caused by: java.lang.NullPointerException
        at com.JusticeKing.SkyBlock.Main.onCommand(Main.java:75) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[spigot.jar:git-Spigot-a03b1fd-95bd423]
        ... 17 more