Bukkit

> [08:58:44 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) ~[server.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [server.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.PlayerList.changeDimension(PlayerList.java:765) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.EntityPlayer.b(EntityPlayer.java:627) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.Entity.postTick(Entity.java:347) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1632) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.World.h(World.java:1601) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.WorldServer.l(WorldServer.java:691) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1403) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:668) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:817) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-dcd1643-e60fc34]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-dcd1643-e60fc34]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.IllegalArgumentException: Cannot use null location!
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) ~[server.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.event.player.PlayerMoveEvent.validateLocation(PlayerMoveEvent.java:91) ~[server.jar:git-Spigot-dcd1643-e60fc34]
at org.bukkit.event.player.PlayerMoveEvent.setTo(PlayerMoveEvent.java:86) ~[server.jar:git-Spigot-dcd1643-e60fc34]
at multiworld.addons.EndPortalHandler.onPlayerPortal(EndPortalHandler.java:41) ~[?:?]
at sun.reflect.GeneratedMethodAccessor500.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-Spigot-dcd1643-e60fc34]
... 16 more

<br />I have multiworld, version spigot 1.12.2<br />What is the reason and how to fix it?