Seems like GunsRPG 1.2.5 and Astral Sorcery (Even the latest version which apparently reverts mixins back to JS ASM) do not work together, giving out a warning about failure to load datapacks that then end in a crash even in safe mode, whereas removing either of them will result in a successful world load without issues.

This is on a pack with quite a few mods though, of note the performance enhancing ones like Rubidium, Magnesium Extras, Oculus, FerriteCore

latest.log
debug.log

I'd suggest to create issue on Astral Sorcery github.
Cause of this is that we use perks data directory with 2 completely different perk data structures so neither of these 2 mods can load all data.
On our side all json errors are handled by skipping loading and just logging error. I'd suggest to do the same