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

SELECT data
  FROM piwigo_sessions
  WHERE id = '035Da561gcj427ma0tlbr4dg2u85f1'
; in /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 845

Call Stack:
    0.0000     241504   1. {main}() /home/sarah/public_html/piwigo/index.php:0
    0.0001     242440   2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/index.php:26
    0.0038     605296   3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0038     606056   4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0039     606248   5. pwg_query() /home/sarah/public_html/piwigo/include/functions_session.inc.php:147
    0.0042     606472   6. my_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:147
    0.0042     606816   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 241504 1. {main}() /home/sarah/public_html/piwigo/index.php:0 0.0001 242440 2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/index.php:26 0.0038 605296 3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156 0.0038 606056 4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156 0.0044 606424 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('035Da561gcj427ma0tlbr4dg2u85f1','',now())
; in /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php on line 845

Call Stack:
    0.0000     241504   1. {main}() /home/sarah/public_html/piwigo/index.php:0
    0.0001     242440   2. include_once('/home/sarah/public_html/piwigo/include/common.inc.php') /home/sarah/public_html/piwigo/index.php:26
    0.0038     605296   3. session_start() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0038     606056   4. pwg_session_read() /home/sarah/public_html/piwigo/include/common.inc.php:156
    0.0044     606424   5. pwg_db_fetch_assoc() /home/sarah/public_html/piwigo/include/functions_session.inc.php:148
    0.0045     606568   6. session_write_close() /home/sarah/public_html/piwigo/include/functions_session.inc.php:0
    0.0045     606872   7. pwg_session_write() /home/sarah/public_html/piwigo/include/functions_session.inc.php:0
    0.0045     607080   8. pwg_query() /home/sarah/public_html/piwigo/include/functions_session.inc.php:169
    0.0047     607176   9. my_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:147
    0.0047     607544  10. trigger_error() /home/sarah/public_html/piwigo/include/dblayer/functions_mysqli.inc.php:845