Error log at join.

[viet]

I see this quite often in the log so it might be helpful to post here.

[08:04:18 INFO]: UUID of player VietNguyen is b7de0a32-064c-45da-bd08-1120b7ff465b
[08:04:18 INFO]: VietNguyen[/10.240.0.3:45189] logged in with entity id 38077 at ([world]256.0, 2.0, 256.0)
[08:04:18 ERROR]: Could not pass event PlayerChangedWorldEvent to Minecraftly v2.0.0-SNAPSHOT-BUKKIT
org.bukkit.event.EventException
        at com.destroystokyo.paper.event.executor.MethodHandleEventExecutor.execute(MethodHandleEventExecutor.java:37) ~[patched_1.10.2.jar:git-Paper-837]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[patched_1.10.2.jar:git-Paper-837]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[patched_1.10.2.jar:git-Paper-837]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) ~[patched_1.10.2.jar:git-Paper-837]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) ~[patched_1.10.2.jar:git-Paper-837]
        at net.minecraft.server.v1_10_R1.PlayerList.moveToWorld(PlayerList.java:711) ~[patched_1.10.2.jar:git-Paper-837]
        at org.bukkit.craftbukkit.v1_10_R1.entity.CraftPlayer.teleport(CraftPlayer.java:580) ~[patched_1.10.2.jar:git-Paper-837]
        at com.minecraftly.bukkit.listeners.PlayerListener.lambda$null$1(PlayerListener.java:239) ~[?:?]
        at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftFuture.run(CraftFuture.java:89) [patched_1.10.2.jar:git-Paper-837]
        at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352) [patched_1.10.2.jar:git-Paper-837]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:781) [patched_1.10.2.jar:git-Paper-837]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:404) [patched_1.10.2.jar:git-Paper-837]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:725) [patched_1.10.2.jar:git-Paper-837]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:624) [patched_1.10.2.jar:git-Paper-837]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.NullPointerException
[08:04:18 INFO]: Using world b7de0a32-064c-45da-bd08-1120b7ff465b for VietNguyen|| Spawn location: Location{world=CraftWorld{name=b7de0a32-064c-45da-bd08-1120b7ff465b},x=697.0,y=72.0,z=-918.0,pitch=0.0,yaw=0.0}