I did have one Asteroid Collector ghost with a circuit network connected. I loaded up 2.0.19 I removed the ghost and the save works with 2.0.20 now.

Thanks again Doublect!

I'm have the same crash, I can't load my main Space Age save. I'll try using 2.0.19 and deleting some ACs to see if that helps.

I do have one space platform that has been neglected in orbit for a while taking asteroid damage. It quite possibly has a AC ghost at this point.

Doublect, thanks for ...