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

SELECT data
  FROM piwigo_sessions
  WHERE id = '23AD31m67vs413bs8tj2p0mn2cc1n2'
; 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