Unkillable Black Crow

The boss, "The Black Crow," suddenly crashed during the first phase and couldn't be attacked. He also attacked me and refused to start phase 2. Due to the glorious mechanic that you can't open portals in boss fights, I was simply trapped in the bypassable map for a while.
Please do your best, GGG. ;)

This just happened to me, can't target or attack him at all and he's stuck at ~70% hp.

This is the PoE 1 section.

There's a large post with others having the same issue over in the PoE 2 section here:
https://www.pathofexile.com/forum/view-thread/3755853