Muluna updated multiple times today, and in one of those updates it seems that compatibility with Any Planet Start was broken.

Muluna itself will load just fine, but when I load Factorio with both Muluna and Any Planet Start, it crashes after loading sprites with the following error:

Failed to load mods: planet-muluna/data-final-fixes.lua:99: attempt to index field 'fluid-handling' (a nil value)
stack traceback:
planet-muluna/data-final-fixes.lua:99: in main chunk

I'm savvy with Baldur's Gate 3 modding and not Factorio, so I don't know exactly what happened here. Only that Muluna works on its own.

All modded planet compatibility is done from the planet's side, not this mod, so unfortunately I can't do much to help you there. I should probably pin that to the top of the discussion list or something, but anyway I'd report that to the Muluna dev. Hopefully that gets fixed soon!

@Dragonfoxing, I opened a bug report with Muluna dev jsut a minute ago. Feel free to add to it or follow: https://github.com/nicholasgower/planet-muluna/issues/261

Looks like Muluna dev just pushed a commit and this should be fixed in Muluna 2.0.22. Appears this is related to issues introduced by changes in 2.0.18.

Thank you so much for the prompt response! It's been so fun doing my first modded save with Muluna and Any Planet Start!

It is working now <3