Player creates Nether portal and it changes his gamemode to Adventure - Error on console

[akoldfart]

Description
I have server where SkyBlock and AcidIsland are created without Nether worlds. I have one portal at the spawn that takes player to "normal" world Nether. It works without issues. However, if player creates portal on his island and uses it, server thow "null" and player's gamemode changes to Adventure and can fly thru walls and such..

Steps to reproduce the behavior:

1. Chreate Island and build nether portal
2. Activate portal '
3. Enter in and you don't get transferred because there is no Nether to go
4. Now your gamemode has changed

Expected behavior
I was hoping portal just not doing anything because there is no Nether to go from island

Screenshots
If applicable, add screenshots to help explain your problem.

Server Information:

[Please complete the following information:]

• Database being used Flat file
• OS: Windows 7
• Java Version: [e.g. Java 8]
• BentoBox version: 0.15.1 (problem also present in 1.14.0)
• Addons installed?
  [00:54:28] [Server thread/INFO]: [Bentobox version: _[0.15.1
  [00:54:28] [Server thread/INFO]: Loaded Game Worlds:
  [00:54:28] [Server thread/INFO]: [AcidIsland_world _[(AcidIsland)]
  [00:54:28] [Server thread/INFO]: [BSkyBlock_world _[(BSkyBlock)]
  [00:54:28] [Server thread/INFO]: Loaded Add-Ons]
  [00:54:28] [Server thread/INFO]: [AcidIsland _[0.4.1-SNAPSHOT]
  [00:54:28] [Server thread/INFO]: [BSkyBlock _[0.5.0-SNAPSHOT]
  [00:54:28] [Server thread/INFO]: [BentoBox-Challenges _[0.0.3-SNAPSHOT]
  [00:54:28] [Server thread/INFO]: [Level _[0.1.0-SNAPSHOT]
  [00:54:28] [Server thread/INFO]: [WelcomeWarps _[0.1.0-SNAPSHOT]
  [Do '/bentobox version' and copy/paste from the console]
• Other plugins? [Do '/plugins' and copy/paste from the console]
  Plugins (19): [CoreProtect[0;37;1m, [WorldEdit[0;37;1m, [WorldBorder[0;37;1m, [Vault[0;37;1m, [0;32;1mEasyBackup[0;37;1m, [0;32;1mHideStream[0;37;1m, [Votifier[0;37;1m, [Permissions[0;37;1m, [0;32;1mProtocolLib[0;37;1m, [0;32;1mWorldGuard[0;37;1m, [FreeBungeeChat[0;37;1m, [0;32;1mBentoBox[0;37;1m, [0;32;1mEssentials[0;37;1m, [EssentialsChat[0;37;1m, [0;32;1mAdvancedModreq[0;37;1m, [PromotionEssentials[0;37;1m, [SimpleVoteListener[0;37;1m, [0;32;1mEssentialsSpawn[0;37;1m, [0;32;1mMultiverse-Core[m
  Additional context
  Error seen on console:

[14:12:09] [Server thread/ERROR]: Could not pass event PlayerPortalEvent to BentoBox v0.14.1
org.bukkit.event.EventException: null
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:308) ~[spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.PlayerList.changeDimension(PlayerList.java:759) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.EntityPlayer.a(EntityPlayer.java:664) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.Entity.postTick(Entity.java:359) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.World.entityJoinedWorld(World.java:1381) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.World.g(World.java:1347) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.WorldServer.p_(WorldServer.java:624) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.World.tickEntities(World.java:1149) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.WorldServer.tickEntities(WorldServer.java:601) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:972) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:835) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:733) [spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_192]
Caused by: java.lang.NullPointerException
	at org.bukkit.Location.getBlock(Location.java:91) ~[spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	at world.bentobox.bentobox.managers.IslandsManager.isSafeLocation(IslandsManager.java:169) ~[?:?]
	at world.bentobox.bentobox.util.teleport.SafeSpotTeleport.<init>(SafeSpotTeleport.java:73) ~[?:?]
	at world.bentobox.bentobox.util.teleport.SafeSpotTeleport$Builder.build(SafeSpotTeleport.java:416) ~[?:?]
	at world.bentobox.bentobox.listeners.NetherPortals.onNetherPortal(NetherPortals.java:237) ~[?:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_192]
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_192]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_192]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_192]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304) ~[spigot-1.13.2-R0.1-SNAPSHOT.jar:git-Spigot-a1f2566-97b0057]
	... 16 more

[tastybento]

Thanks for the report!