Previously I was using Spigot's serialization of locations into the last-locations.yml file. There would be an error deserializing if a world was changed. Now I'm using my own serialization in which I store the UUID of the world, and if the world is deleted, only a 1 line warning will be displayed.
If you were having this problem, it will likely be fixed after the second restart.

This update is tested for 1.20
Also in this update, a built-in /back command was added. By default, it is disabled. You can customize the command settings with a new configuration section.
To enable the command, set register to true.

A whole bunch of random things this update

1. New config option: deny-nonmembers: this will not allow people to /back into regions that they aren't a member of
2. New config option to change the deny message
3. New config option to enable using GriefPrevention's deny message instead of DenyBack's message
4. Debug mode - You guys won't have to use this unless you are having problems
5. DenyBack now hooks into CMI's minimum teleport distance so it records teleportation more consistently

Check the config notes for a little more information on each setting. Let me know if you want any new features.

It has definitely been a while since I last updated this plugin. I did a bit of optimization, but the main feature that effect you will be the new back-on-death check. There is 1 new option in the config called back-on-death-permission. This option allows you to enter a permission string to enable the plugin to check that permission when the player dies and stores that location. In summary, this makes the plugin more accurate in determining a player's last position.

Config example option:

Plugin works with 1.19

Plugin works with 1.18 now

I've tested the plugin on 1.8.8 and 1.12.2 and it seems to be working, but I am only just one person so there may be bugs. Feel free to let me know. I check spigot frequently. You can get the new version here while I contemplate how to display it on my page.

Change Log:

• Records teleportation and last location more similar to essentials (Will be more accurate in denying the correct locations)
• If GriefPrevention is enabled, players will not be able to do /back to get back into another player's claim they do not have access too. This can be disabled in the config
• /denyback reload command to reload the config

Now works with 1.17 & a few new features were added.

• Added config so you can choose which commands are denied
• Always has a back location stored for a player so it stops the teleport from happening instead of checking after the teleport
• now works with cooldowns
• Now records last location in a file so it works when server restarts