Please click on apple icon and choose about this mac, could please tell what is the graphics card installed on your machine.
if it is possible can you paste the crash report here ?
Thanks for replying. It is an AMD Radeon R9 M290X 2048 MB.
Can you Click on Lightroom Icon just beside the apple icon and choose preferences, go to the performance tab and uncheck the "Use gpu option"
Click on ok and restart the Lightroom, use it and check if it is still crashing.
Ok. I'll let you know how it works? If it does work, is going to be a permanent solution or will there be a software update that will address the issue?