Owners can promote themselfs and loose all permissions.

[mataai]

If the owner of a kingdom promotes himself it sets his permission level to null (probably because it tries to get a permission level above owner).

This causes his permission level to be corrupted and therefore causes a loss of all permissions to the kingdom.

Owners should be blocked from being promoted and users shouldn't be allowed to promote themselves.

[mataai]

[00:00:58 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'kd' in plugin Kingdom v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:47) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:155) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
        at org.bukkit.craftbukkit.v1_20_R1.CraftServer.dispatchCommand(CraftServer.java:1003) ~[paper-1.20.1.jar:git-Paper-62]
        at org.bukkit.craftbukkit.v1_20_R1.command.BukkitCommandWrapper.run(BukkitCommandWrapper.java:64) ~[paper-1.20.1.jar:git-Paper-62]
        at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:265) ~[paper-1.20.1.jar:?]
        at net.minecraft.commands.Commands.performCommand(Commands.java:324) ~[?:?]
        at net.minecraft.commands.Commands.performCommand(Commands.java:308) ~[?:?]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.performChatCommand(ServerGamePacketListenerImpl.java:2299) ~[?:?]
        at net.minecraft.server.network.ServerGamePacketListenerImpl.lambda$handleChatCommand$20(ServerGamePacketListenerImpl.java:2259) ~[?:?]
        at net.minecraft.util.thread.BlockableEventLoop.lambda$submitAsync$0(BlockableEventLoop.java:59) ~[?:?]
        at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1768) ~[?:?]
        at net.minecraft.server.TickTask.run(TickTask.java:18) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:153) ~[?:?]
        at net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24) ~[?:?]
        at net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1339) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:197) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:126) ~[?:?]
        at net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1316) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1309) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.util.thread.BlockableEventLoop.managedBlock(BlockableEventLoop.java:136) ~[?:?]
        at net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1287) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1175) ~[paper-1.20.1.jar:git-Paper-62]
        at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:318) ~[paper-1.20.1.jar:git-Paper-62]
        at java.lang.Thread.run(Thread.java:833) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "ca.ultracrepidarianism.kingdom.database.models.enums.PermissionLevelEnum.hasPermission(ca.ultracrepidarianism.kingdom.database.models.enums.PermissionLevelEnum)" because the return value of "ca.ultracrepidarianism.kingdom.database.models.KDPlayer.getPermissionLevel()" is null
        at ca.ultracrepidarianism.kingdom.commands.subcommands.ClaimCommand.perform(ClaimCommand.java:43) ~[Kingdom-1.0-SNAPSHOT.jar:?]
        at ca.ultracrepidarianism.kingdom.commands.CommandManager.onCommand(CommandManager.java:46) ~[Kingdom-1.0-SNAPSHOT.jar:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45) ~[paper-api-1.20.1-R0.1-SNAPSHOT.jar:?]
        ... 23 more

[mataai]

Potentially fixed commit dd855b5