I'm trying to teleport the player to my custom dimension, the setDimension function has worked before but this time it crashed the game.

Spoiler

[11:26:09] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
    at java.util.concurrent.FutureTask.report(FutureTask.java:122) ~[?:1.8.0_181]
    at java.util.concurrent.FutureTask.get(FutureTask.java:192) ~[?:1.8.0_181]
    at net.minecraft.util.Util.runTask(Util.java:54) [Util.class:?]
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:795) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:740) [MinecraftServer.class:?]
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:589) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181]
Caused by: java.lang.NullPointerException
    at net.minecraft.world.Teleporter.placeInExistingPortal(Teleporter.java:136) ~[Teleporter.class:?]
    at net.minecraft.world.Teleporter.placeInPortal(Teleporter.java:36) ~[Teleporter.class:?]
    at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:748) ~[PlayerList.class:?]
    at net.minecraft.server.management.PlayerList.transferPlayerToDimension(PlayerList.java:655) ~[PlayerList.class:?]
    at net.minecraft.server.management.PlayerList.changePlayerDimension(PlayerList.java:642) ~[PlayerList.class:?]
    at net.minecraft.entity.player.EntityPlayerMP.changeDimension(EntityPlayerMP.java:745) ~[EntityPlayerMP.class:?]
    at com.spaceboyross.gundam.net.server.PacketDimensionServer$Handler.handle(PacketDimensionServer.java:45) ~[PacketDimensionServer$Handler.class:?]
    at com.spaceboyross.gundam.net.server.PacketDimensionServer$Handler.lambda$0(PacketDimensionServer.java:38) ~[PacketDimensionServer$Handler.class:?]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_181]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_181]
    at net.minecraft.util.Util.runTask(Util.java:53) ~[Util.class:?]
    ... 5 more

 

 

You should be providing your own teleporter implementation.

3 minutes ago, quadraxis said:

You should be providing your own teleporter implementation.

I did, but relaunching the game fixes the issue.