Not 100% sure Dense Metals is the problem here (I'm running it with some other mods), but the crash log says Dense Metals has something to do with it. I've been getting this error since installing Primitive Mobs, so maybe that'll help narrow it down?

https://pastebin.com/gM4GguwW

Does this happens without Primitive m9bs?

Strange, it started happening around the same time I installed Primitive Mobs, but it's happening without it. Any new chunk generation crashes the game

Probably another mod causing problems to my world gen, If you could find out what mod is that would be helpful

Oh, If you don't have Base Metals try disabling the Base Metals dense ores from the config

Yep, that fixed it. Very odd, was support for Base Metals added recently? Been using the mod for months without issue. Either way, thanks for the assistance!

dang I'm pretty sure I put a fail safe for when Base Metals is not present, will double check

oh derp me, I did put a safe-fail but for the Blocks only not for the generator, will fix it on next version

oh and yeah Base Metals compat was added in version 1.1.0!

fixed bdb2e61