Disabling "Coral Forest" biome in settings causes runtime error

I disabled the "Coral Forest" biome in the mod's settings in my attempt to only have this mod's cave biomes be generated in the world. This resulted in the error shown at the bottom.

I've tested this further by generating a new world using only the Everness mod and with only the "Coral Forest" biome disabled. It results in the same error.

Other tests generating a new world with all biomes, except "Coral Forest", disabled did not result in any crashes. This includes having "Coral Forest Dunes", "Coral Forest Ocean" and "Coral Forest Under" all disabled while "Coral Forest" is still enabled.

I tested this stuff on new worlds that were generated using v7 or valleys mapgen on Minetest 5.6.1 on a Linux system.

AsyncErr: Lua: Runtime error from mod 'everness' in callback environment_OnGenerated(): /home/xxxxxxxxx/.minetest/mods/everness/mapgen_after.lua:84: attempt to concatenate upvalue 'deco_id_coral_bones_tree' (a nil value) stack traceback: /home/xxxxxxxxx/.minetest/mods/everness/mapgen_after.lua:84: in function </home/xxxxxxxxx/.minetest/mods/everness/mapgen_after.lua:53> /usr/share/minetest/builtin/game/register.lua:431: in function </usr/share/minetest/builtin/game/register.lua:417>

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