Going into further details would help me pass along info to our devs for a resolution. Some MacOS issues have been fixed, and we'd like to fix yours, too.
Hi there! I checked in with our Devs, and they'd like you to make a post on the Paradox forums, and attach the crash logs so they can investigate, please!
You can find the logs in Documents > Paradox Interactive > Stellaris > Crashes -- please zip the folder created with this crash and attach it to your report.
https://forum.paradoxplaza.com/forum/forums/stellaris-bug-reports.941/
Thanks!