Hi devs !

SQL error in admin login.
When browsing an album, on the thumbnails page of this album, and I want to edit the album scheduled for the icon, I get this error:

[mysql error 1064] You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 7

SELECT
    COUNT(image_id),
    MIN(DATE(date_available)),
    MAX(DATE(date_available))
  FROM piwigo_images
    JOIN piwigo_image_category ON image_id = id
  WHERE category_id =
;

#1    my_error E:\www\piwigo2.4b2\include\dblayer\functions_mysql.inc.php(88)
#2    pwg_query E:\www\piwigo2.4b2\admin\cat_modify.php(270)
#3    include E:\www\piwigo2.4b2\admin.php(263)

The album is virtual and photos have been uploaded with the upload tool from admin panel.