[17:39:33 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'k' in plugin PublicKingdom v0.1
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:139) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:702) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1641) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1476) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:1) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_211]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_211]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:895) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:830) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:728) [spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: java.lang.NullPointerException
        at net.zwet.publickingdom.commands.Setspawn.onCommand(Setspawn.java:52) ~[?:?]
        at net.zwet.publickingdom.commands.BaseCommand.onCommand(BaseCommand.java:89) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.13.2.jar:git-Spigot-518206a-a5b9c7b]
        ... 15 more