The game runs normally and i can play my worlds. But after some time of playing it just freezes and crashes.
This issue is marked as unexpected error but what i can read it is caused by:
hellfirepvp.astralsorcery.common.perk.PerkAttributeMap.getModifier.
This issue has been happenning ever since the version 1.13.4 and still having it in the latest 1.13.6 version.

I know little about coding, but i can confirm it is caused by this since i reported this issue in the FeedTheBeastCrashes subreddit.
Here's the Latest log: https://pastebin.pl/view/20628dc7

Can you provide a screencap of your perk tree's selections, as well as any gear you're wearing with Attributes on them via Refraction Table enchanting, any dynamism gems, etc?

Can you provide a screencap of your perk tree's selections, as well as any gear you're wearing with Attributes on them via Refraction Table enchanting, any dynamism gems, etc?

Would you mind testing this again with this version?

https://jenkins.hellfiredev.net/job/AstralSorcery/job/1.16-indev/48/artifact/astralsorcery-1.16.4-1.13.7.jar

So far, almost 3 hours of playing and the game didn't crashed!
it seems it's now fixed.