Error while change biome's spawn rarity

[Rokko Effe]

I created a new world, then stopped the server and edited "world-settings.json". In this file I've only increased % of TUNDRA and decreased % of FOREST. But I get error on server start: "Failed to calculate biome rarity".

world-settings.json: https://pastebin.com/x8YixTKq EWG crash report: https://pastebin.com/zPdbKMZK

[minelazz]

Make sure a tundra biome is also added