RStudio quits unexpectedly under macOS Catalina

Hi, and welcome!

Please see the FAQ: What's a reproducible example (`reprex`) and how do I do one? Using a reprex, complete with representative data will attract quicker and more answers. This question, though, doesn't require one.

I'm not getting this on my Airbook 2015, under R.3.6.3 notarized and RStudio 1.3.820 with the default global options General | Advanced | OS Integration settings, but I saw one other report of similar behavior.

What's does your sessionInfo() show?