SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: DELETE FROM bb1_sessions WHERE lastactivity<1558383731
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: 20.05.2019 @ 22:52
Script: /profile.php?userid=300&amp
Referer: