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

SELECT data
  FROM jerrya_sessions
  WHERE id = 'C0A87l5fftnqfc1vdc52i256gqjsa6'
; in /home/jerrya/public_html/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/jerrya/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 228