SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: DELETE FROM bb1_sessions WHERE userid='0' AND ipaddress = '34.226.234.20' AND useragent = 'CCBot/2.0 (https://commoncrawl.org/faq/)'
mysql error: Table './usr_web62_1/bb1_sessions' is marked as crashed and last (automatic?) repair failed
mysql error number: 144
mysql version: 5.5.59-0+deb7u1
php version: 5.3.29
Date: 23.09.2019 @ 19:54
Script: /thread.php?threadid=1958&goto=lastpost
Referer: