Im dealing with the same issue. My LR Classic was working perfectly without fail, then all of a sudden anytime I click on "Import" it takes awhile to load, then crashes. I was using version 10.1.1. Then when I started to have problems I updated to version 10.2. But that didn't fix the issue. And im running it on windows 10.
Im kind of thinking my current catalog is in some way corrupt. When I created a new catalog, I can get images to import. But then it quickly starts to crash again when I try to import a new project. I tried "Optimize Catalog" (Hadn't done that in over a year) that helped and did allow me to import, but when I went to import a new project it once again crashes on the import screen. I usually trasfer all images into files from SD card, then import to LR from desktop. But don't believe that has anything to do with current situation, becuase it freezes and crashes right when import screen is opened (before anyting has been clicked). Everything else in Lightroom is working perfectly.