error

[04:04:30] [Server thread/WARN]: [ApeironKingdoms] Doing an operation on the main thread that should be done async!
java.lang.Throwable: null
	at me.crz.minecraft.kingdoms.utils.Utils.catchSync(Utils.java:488) ~[?:?]
	at me.crz.minecraft.kingdoms.db.MySqlDatabaseManager.getResident(MySqlDatabaseManager.java:531) ~[?:?]
	at me.crz.minecraft.kingdoms.village.ResidentManager.getResident(ResidentManager.java:103) ~[?:?]
	at me.crz.minecraft.kingdoms.village.ResidentManager.getResident(ResidentManager.java:87) ~[?:?]
	at me.crz.minecraft.kingdoms.Advancements.on(Advancements.java:23) ~[?:?]
	at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor1029.execute(Unknown Source) ~[?:?]
	at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:67) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at org.bukkit.plugin.EventExecutor$$Lambda$2325.00000000D8A7DEB0.execute(Unknown Source) ~[?:?]
	at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:514) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.PlayerList.onPlayerJoin(PlayerList.java:369) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.PlayerList.a(PlayerList.java:180) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.LoginListener.b(LoginListener.java:169) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.LoginListener.tick(LoginListener.java:65) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.NetworkManager.a(NetworkManager.java:271) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.ServerConnection.c(ServerConnection.java:129) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1125) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:938) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:836) ~[patched_1.13.2.jar:git-Paper-"988887d2"]
	at java.lang.Thread.run(Thread.java:813) [?:1.8.0_202]