Choosing Recent Files repository in the filepicker always returns a Database Error window.
An SQL error message is logged in the PHP-errors log file, see attached example of the error.

Changed LIB.PHP in the Recent repository:

Use this SQL query:
$sql = 'SELECT * FROM

WHERE userid = ? AND filename != ? AND ((filearea = ? AND itemid = ?) OR filearea != ?)
GROUP BY contenthash, filename) files2 ON files1.id = files2.maxid
ORDER BY files1.timemodified DESC';

Is joining the table onto itself and was returning the same fieldnames more than once, removed dups and renamed the key.

Now works as expected.