Biome percentages are correct but it crashes

[Alejandro Casal]

Plugin version: 7.2.29 Spigot username: Aribaba95 Issue: When I create a new world and then change the settings, next time I try to start the server it crashes because EWG says that it can't calculate biome rarity, but percentages are correct. Link to settings file (world-settings.json, possibly also biome settings if you have created your own): https://pastebin.com/8e4zy80h Link to error log/crash log: https://pastebin.com/vnfcZrGD