While writing this, Steam updated to 0.16.6 and the issue is not reproducible. Best response time ever!

I'm running Factorio 0.160.5 (From Steam) and MacOS 10.12.6 on a MacBook Pro. When I try to delete a particular power pole, the game crashes. I was able to delete other power poles in the game, but it crashes when I try to delete the power pole next to my (one and only) boiler. This happened after ...