Hi there, we got a problematic crash with Factorio v 2.1.20 (Date: 22.09.2026)
Replaced ItemPrototype::fuel_category with ItemPrototype::fuel_categories.
Game won't load:
Failed to load mods: Error while loading item prototype "coal" (item): ItemPrototype::fuel_category was removed. Please use ItemPrototype::fuel_categories.

For anyone having this issue, just go back to 2.1.19 for the time being, until a patch is released.

https://wiki.factorio.com/Version_history/2.1.0#2.1.20

Hi,

Thanks for the report!
This should be fixed in 0.6.4

Thank you boss!