Bukkit

I get this in the console whenever someone teleports to the creative world from the survival world. It also causes some serious lag for a few seconds.

[05:32:57] [Server thread/INFO]: [MultiWorld] @: Moved player Teanne to world world_creative

[05:33:12] [Server thread/ERROR]: Could not pass event PlayerPortalEvent to MultiWorld v5.2.8

org.bukkit.event.EventException: null

at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.PlayerList.changeDimension(PlayerList.java:762) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.EntityPlayer.b(EntityPlayer.java:618) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.Entity.postTick(Entity.java:346) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1632) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.World.h(World.java:1601) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.WorldServer.l(WorldServer.java:688) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1403) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:665) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:817) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]

Caused by: java.lang.IllegalArgumentException: Cannot use null location!

at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at org.bukkit.event.player.PlayerMoveEvent.validateLocation(PlayerMoveEvent.java:91) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at org.bukkit.event.player.PlayerMoveEvent.setTo(PlayerMoveEvent.java:86) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

at multiworld.addons.EndPortalHandler.onPlayerPortal(EndPortalHandler.java:41) ~[?:?]

at sun.reflect.GeneratedMethodAccessor80.invoke(Unknown Source) ~[?:?]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]

at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]

at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[minecraft_server.jar:git-Spigot-4bd94dc-f4ca180]

... 16 more