Ever since I installed the latest updates to LR & PS, I have had consistent crashes of lightroom. I am on a Mac running OS 10.11. LR will do it's crash thing no matter what I am doing or even not doing, like looking at a photo. Numerous crash reports sent to Adobe. This latest update seem very buggy from what I am reading.
There are many confirmed issues with LR 6.2 - you may try the steps here: Update on Lightroom 2015.2 / Lightroom 6.2 Release
Anyhow, you are best helped if you roll back to 6.1.1 as many users: http://www.lightroomqueen.com/how-do-i-roll-back-to-lightroom-2015-1-1-or-lightroom-6-1-1/
There are hundreds of threads covering the same.
I had the same problem. Decided to switch to Capture One Pro 9. Haven't had a crash yet.