Same problem here, started two days ago when Adobe CC LR was updated. System: MacBook Pro (13-inch, Late 2016, Four Thunderbolt 3 Ports) macOS Sierra v.10.12.5. (16F73) Lightroom Map function has worked fine from year of launching, on differents Mac computers, but crashed when I updated LR on June 14.
Pete, there is plenty of feedback now that the problem is NOT related to a specific computer system nor LR version. Can you please take action and contact Google for verification if their server acts up and give us feedback? Thanks in advance.