Apple just released a security update for macOS Catalina 10.15.7 that fixes the bug that was introduced in the previous security update. I installed this update earlier today and confirmed that it fixes the crashing issue.
Note that updating to macOS 11 is still the better option if that is available for your machine.
-wim
on my mac mini I have Mojave, same thing, crashes all the time. What I just found out, when I save the file I am working, on my desktop and not iCloud (where I keep all my files) Apparently It doesn’t crash.
Could this be possible?