In reply to Denis.

Yes Denis. That's exactly what I was referring to. WPML already got an update which fixed the newly-introduced compatibility problem. It was a very simple fix and we released it quickly after we saw WordPress 4.8.3.
Had we been able to see this version of WordPress before it was released, we would have updated our code ahead of time. It's impossible to come up with updates for WP versions that come without betas, over night, during a major holiday.