Crashing when reaching ~30% WB Fill with the plugin installed.

Version: 8.1.8
Spigot: Flare_fortress92
Issue: When using world border fill on default settings (Which works with a world not using EWG) it will crash at about 30% full saying that it is using a malformed class name. It also says the same when loading the plugin.
Setting: https://hastebin.com/uzawotiyef.json
Error Log: https://hastebin.com/iruyixetav.bash