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

SELECT DISTINCT(DAYOFMONTH(date_available)) as period,
  COUNT(DISTINCT id) as nb_images FROM piwigo_images
INNER JOIN piwigo_image_category ON id = image_id
WHERE category_id IN (1398)
     AND date_available BETWEEN '2017-09-01' AND '2017-09-30 23:59:59'
  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