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

SELECT data
  FROM piwigo_sessions
  WHERE id = '23ADo0n0v7p6t4i28st7g2fc7flpa3'
; 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