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

SELECT data
  FROM piwigo_sessions
  WHERE id = '12CC1dpiu1jogjp660uune5j0e8883'
; in /home/photo/www/piwigo/include/dblayer/functions_mysqli.inc.php on line 864
Fatal error: Call to a member function fetch_assoc() on a non-object in /home/photo/www/piwigo/include/dblayer/functions_mysqli.inc.php on line 228