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

SELECT data
  FROM p_sessions
  WHERE id = '03E2021e109bc112fe3c11a1e71cade5d981'
; in /mnt/sdb/meedia/piwigo/include/dblayer/functions_mysqli.inc.php on line 856
Warning: session_start(): Failed to read session data: user (path: /var/lib/php/session) in /mnt/sdb/meedia/piwigo/include/common.inc.php on line 141 Fatal error: Uncaught Error: Call to a member function fetch_assoc() on boolean in /mnt/sdb/meedia/piwigo/include/dblayer/functions_mysqli.inc.php:220 Stack trace: #0 /mnt/sdb/meedia/piwigo/include/functions_session.inc.php(133): pwg_db_fetch_assoc(false) #1 [internal function]: pwg_session_read('021e109bc112fe3...') #2 /mnt/sdb/meedia/piwigo/include/common.inc.php(141): session_start() #3 /mnt/sdb/meedia/piwigo/picture.php(10): include_once('/mnt/sdb/meedia...') #4 {main} thrown in /mnt/sdb/meedia/piwigo/include/dblayer/functions_mysqli.inc.php on line 220