@mwbarican does seem to fix the issue – This is in the file popup.php
I also found an instance in popup-load.php on line 191 that I would recommend making the same change to Scheme_Typography
I ran into the same issue. I had to disable PopBox for Elementor in order for the database upgrade to 3.6.2 to proceed successfully.
I put in a ticket when I first noticed this issue, and was told they sent it to an “engineer” to fix it. That was a long time ago, so guessing that’s the polite way to say it went to the great black hole 🙂
