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

SELECT data
  FROM piwigo_sessions
  WHERE id = '035Ddt7l2kv4fh008l461ce618ikp4'
; in /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 845

Call Stack:
    0.0000     242016   1. {main}() /home/sarah/public_html/piwigo/picture.php:0
    0.0001     242952   2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/picture.php:25
    0.0019     605800   3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0019     606560   4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0019     606752   5. pwg_query() /home/sarah/public_html/piwigo/include/functions_session.inc.php:147
    0.0023     606976   6. my_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:147
    0.0023     607320   7. trigger_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:845

Fatal error: Call to a member function fetch_assoc() on boolean in /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 226 Call Stack: 0.0000 242016 1. {main}() /home/sarah/public_html/piwigo/picture.php:0 0.0001 242952 2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/picture.php:25 0.0019 605800 3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156 0.0019 606560 4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156 0.0024 606928 5. pwg_db_fetch_assoc() /home/sarah/public_html/piwigo/include/functions_session.inc.php:148
Warning: [mysql error 145] Table './sarah/piwigo_sessions' is marked as crashed and should be repaired

REPLACE INTO piwigo_sessions
  (id,data,expiration)
  VALUES('035Ddt7l2kv4fh008l461ce618ikp4','',now())
; in /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 845

Call Stack:
    0.0000     242016   1. {main}() /home/sarah/public_html/piwigo/picture.php:0
    0.0001     242952   2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/picture.php:25
    0.0019     605800   3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0019     606560   4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0024     606928   5. pwg_db_fetch_assoc() /home/sarah/public_html/piwigo/include/functions_session.inc.php:148
    0.0024     607072   6. session_write_close() /home/sarah/public_html/piwigo/include/functions_session.inc.php:0
    0.0024     607376   7. pwg_session_write() /home/sarah/public_html/piwigo/include/functions_session.inc.php:0
    0.0025     607584   8. pwg_query() /home/sarah/public_html/piwigo/include/functions_session.inc.php:169
    0.0025     607680   9. my_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:147
    0.0025     608048  10. trigger_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:845