Error message on pages

My uploaded album ( is online and, as usual, looks good and works as normal. But below the pages I get a error message:
Something went wrong
Unexpected error: Trying to access array offset on value of type null in AlbumDAO.php on line 817
Please report error at
As reported: the album looks good but this time is larger than normal.
What went wrong?

Is your installation of Backlight up to date?

As Rod mentioned. Which version of Backlight are you using? That doesn’t look like a matching line in Backlight 4’s code.

Yes, I’ve updated all modules in Backlight 4.02

Backlight 4.02