Cyask! info: MySQL Query Error

Time: 2018-10-16 12:26pm
Script: /asknew/index.php

SQL: DELETE FROM ask_sessions WHERE lastactive<(1539692810-300)
Error: Table '.\cyasknew0218\ask_sessions' is marked as crashed and should be repaired
Errno.: 145

Similar error report has beed dispatched to administrator before.