https://1drv.ms/f/c/e1120e79b63ebbbb/Eru7PrZ5DhIggOEJYQEAAAABR8KBfk9BbCbkE1AKwW_bLg?e=oI563V
All mods are in the latest version, I play the experiment version of Factorio

Boy, that is a lot of mods... I might have an idea of what's causing this, though. I think one of your mods is defining a resource that's managing to slip past all of my checks. My guess is it lacks both resource and resources, which is causing my ore to not initialise. I should add a sanity check for initialisation before attempting to add it to the list. I'd meant to change a few other things, so expect a new version soon-ish.

I forgot to mention - fixed in 1.2.2. Let me know if it still crashes.

It still crashed.
https://1drv.ms/f/c/e1120e79b63ebbbb/Eru7PrZ5DhIggOEJYQEAAAABR8KBfk9BbCbkE1AKwW_bLg?e=mvTPc6

Well... for reasons unknown, the fix I made isn't in 1.2.2. No idea how it happened. It's for sure in 1.2.3, though. Give that a shot and let me know if it works. I'm explicitly checking for a nil ore and skipping it now, so this specific crash should be fixed.

Fixed, Thanks

Can I see your log after the fix, though? I'd like to know what mod is causing that, and log will tell me. There's a new "skip" message in there for ores which couldn't be identified.

Ok, but I've added more mods on the way and they're compatible toward each other
https://1drv.ms/f/c/e1120e79b63ebbbb/EvIFH_-J9chDm_Ut5y4XXxQBw51WHBP9jxEsetprvkdNfw?e=oeMof9

Found what's causing it. It's fermium-ore from I believe SpFu Material Pack and maraxsis-coral from Maraxsis. I looked at both and I don't really see an in their code, meaning it's something I'm doing wrong. OK, time to troubleshoot. Thanks for the info, it was very valuable.

edit
Figured it out. I'm mishandling ore assignment for resources with multiple ores. In technical terms, I misunderstood the scope of indexing variables in a loop and was trying to use their values outside the loop. That's what was producing the nil values. That's an easy fix, but the mod will still only grab one ore out of resources with multiple ores. Need a better way to handle that.

Fixed in 1.2.4. Recipes should be properly generated for SpFu Material and Maraxis ores now (they were skipped previously). This should also improve compatibility with other mods which introduce resources with multiple results (or even a single result using the "results" table). Thanks for the log - it made all the difference.