Mac Mojave 10.14.6
LR classic 8.4
PS CC 2019 20.0.6
Also, It could be a corrupt cache or application state, or directory damage. Please give your Mac the "once over"! Run the free Onyx (https://www.titanium-software.fr/en/o...), reboot. (In Onyx just run almost everything in the Maintenance tab, deselecting things you may not want deleted, like Launch Services, also hit the "Options" button and deselect more stuff like Cookies & Other Site Data, Browser History, Form Values, etc. that you want to keep), then hit Run Tasks. After it's done it will ask for a reboot.
If that doesn’t fix it run Disk Warrior if you can ($120), (https://www.alsoft.com), reboot. If you can’t do Disk Warrior, at least run First Aid from Disk Utility. Also just doing a "Safe Boot" can clear out caches (restart, hold down shift until you see "Safe Boot" on the screen, then reboot normally.If that doesn’t work try launching Lightroom from your other (admin or test) account, with a new catalog, as a test. Does it run OK then?