Warning: [mysql error 144] Table './piwigo_miki/sessions' is marked as crashed and last (automatic?) repair failed

SELECT data
  FROM sessions
  WHERE id = '3690gh1d6imhft7f1jqhms1cg4kp34'
; in /srv/www/www.semeliker.net/include/dblayer/functions_mysqli.inc.php on line 856
Fatal error: Call to a member function fetch_assoc() on a non-object in /srv/www/www.semeliker.net/include/dblayer/functions_mysqli.inc.php on line 220