Warning: [mysql error 145] Table './photogallery/piwigo_images' is marked as crashed and should be repaired

SELECT DISTINCT(YEAR(date_creation)) as period,
  COUNT(DISTINCT id) as nb_images FROM piwigo_images
INNER JOIN piwigo_image_category ON id = image_id
WHERE category_id IN (1664)
     AND date_creation IS NOT NULL
  GROUP BY period; in /webapp/photogallery/include/dblayer/functions_mysqli.inc.php on line 832
Fatal error: Call to a member function fetch_assoc() on a non-object in /webapp/photogallery/include/dblayer/functions_mysqli.inc.php on line 880