Lightroom Crush my iMac

Hello,

I dont know what is going on, but for several times now, every single time that I am using Lightroom CC, my iMac crushes, and after the computer goes all black, I just get a message "Your computer is recovering from an unexpected system crush" and I have to reboot. This only happens when I use Lightroom, no other application make this on my computer, I will like to know what is going on about. Any help please!