This is not really a problem, but a lot of users seems to have this issue, so I'm patching it. If you are running the plugin without any issues don't worry about anything in this update.

• Player kit is now always set to the default value from config at Options.Default-Dragon-Escape-Kit/Options.Default-Dragons-Kit.
• If the default kit is not set/is invalid, the next step is to get a random kit from the kit list.
• AND THEN after that, the selected player kit, if valid, is loaded.
• Values from a non-present in player data is not sent to the database, please set the correct default value in options.yml.

What changes?
Previously, if you changed the kit value in the kit file, players would still able to have the old kit reference selected, causing errors because you probably didn't change the default kit in config also.
Now we have a preventive method to always get a kit from the loaded kit list.