Failed to load mods: k2-flare-stack/lib/private/data-stages/helpers.lua:250: attempt to perform arithmetic on field 'icon_size' (a nil value)
stack traceback:
k2-flare-stack/lib/private/data-stages/helpers.lua:250: in function 'addOverlayIconsToRecipe'
...lare-stack__/lib/public/data-stages/flare-stack-util.lua:181: in function 'generateBurnFluidsRecipe'
...lare-stack__/lib/public/data-stages/flare-stack-util.lua:231: in function 'generateBurnFluidsRecipes'
k2-flare-stack/data-updates.lua:10: in main chunk

Mods to be disabled:
• k2-flare-stack (1.1.0)

I also see the same error

Apologies. I will fix this soon.
Meanwhile, I will remove the broken version.