[20:20:42] [Server thread/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_77]
	at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_77]
	at net.minecraft.util.Util.runTask(Util.java:24) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:738) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:683) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:155) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:532) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_77]
Caused by: java.lang.NullPointerException
	at fr.elias.rumbledimension.dimension.RDTeleporter.placeInExistingPortal(RDTeleporter.java:138) ~[RDTeleporter.class:?]
	at fr.elias.rumbledimension.dimension.RDTeleporter.placeInPortal(RDTeleporter.java:39) ~[RDTeleporter.class:?]
	at net.minecraft.server.management.PlayerList.transferEntityToWorld(PlayerList.java:733) ~[PlayerList.class:?]
	at net.minecraft.server.management.PlayerList.transferPlayerToDimension(PlayerList.java:640) ~[PlayerList.class:?]
	at fr.elias.rumbledimension.common.ItemTest.onItemRightClick(ItemTest.java:26) ~[ItemTest.class:?]
	at net.minecraft.item.ItemStack.useItemRightClick(ItemStack.java:173) ~[ItemStack.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.processRightClick(PlayerInteractionManager.java:387) ~[PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processPlayerBlockPlacement(NetHandlerPlayServer.java:741) ~[NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerBlockPlacement.processPacket(CPacketPlayerBlockPlacement.java:43) ~[CPacketPlayerBlockPlacement.class:?]
	at net.minecraft.network.play.client.CPacketPlayerBlockPlacement.processPacket(CPacketPlayerBlockPlacement.java:9) ~[CPacketPlayerBlockPlacement.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:15) ~[PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_77]
	at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_77]
	at net.minecraft.util.Util.runTask(Util.java:23) ~[Util.class:?]
	... 5 more