deleted the mod itself

Insufficient information. Please read the FAQ at https://mods.factorio.com/mod/AbandonedRuins_updated_fork/faq for correctly reporting errors. I was able to save the game.

its fine, it was the ruins mod : planet settings that was making game unplayable, constantly throwing errors

No, it wasn't fine. The error must happen because the "inner" functions surfaces.exclude() and surfaces.reinclude() need to check on exclusion status. The 1.4.2 release will fix that issues. Also I don't like the < 1.4.0 condition in info.json as any older version is unsupported and is subject to be removed in the future.

probably, but i just removed that mod and just using default, which is ruins only on nauvis