mysqlerror

[17:08:54 INFO]: ApproachingVerti issued server command: /village claim 247 637
[17:08:54 INFO]: [ApeironKingdoms] Chunk 247-Kingdoms-637 was claimed by Vapeville
[17:08:55 INFO]: ApproachingVerti issued server command: /village claim 247 637
[17:08:55 INFO]: SlaughterPrevail issued server command: /sethome med
[17:08:57 ERROR]: [ApeironKingdoms] Error while saving village Vapeville to database!
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'chiefId' cannot be null
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_191]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_191]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_191]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_191]
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2495) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2124) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2058) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5158) ~[patched_1.13.2.jar:git-Paper-470]
        at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2043) ~[patched_1.13.2.jar:git-Paper-470]
        at me.crz.minecraft.kingdoms.libs.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[?:?]
        at me.crz.minecraft.kingdoms.libs.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[?:?]
        at me.crz.minecraft.kingdoms.db.MySqlDatabaseManager.save(MySqlDatabaseManager.java:903) ~[?:?]
        at me.crz.minecraft.kingdoms.db.MySqlDatabaseManager.saveVillage(MySqlDatabaseManager.java:230) ~[?:?]
        at me.crz.minecraft.kingdoms.db.MySqlDatabaseManager$SaveQueue.lambda$new$0(MySqlDatabaseManager.java:1275) ~[?:?]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:82) ~[patched_1.13.2.jar:git-Paper-470]
        at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) ~[patched_1.13.2.jar:git-Paper-470]
        at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.13.2.jar:git-Paper-470]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_191]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_191]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_191]