SELECT cat_id
  FROM phpwebgallery_user_access
  WHERE user_id = 
;
[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 3

SELECT cat_id
  FROM phpwebgallery_user_group AS ug INNER JOIN phpwebgallery_group_access AS ga
    ON ug.group_id = ga.group_id
  WHERE ug.user_id = 
;
[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 4

DELETE FROM phpwebgallery_user_cache
  WHERE user_id = 
;
[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 2

INSERT INTO phpwebgallery_user_cache
  (user_id,need_update,forbidden_categories,nb_total_images)
  VALUES
  (,'false','0',430)
;
[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 ''false','0',430)' at line 4