Ошибка SQL

Произошла непредвиденная ошибка. Невозможно продолжить выполнение запроса.

SQL Error:
1194 - Table 'mybb_users' is marked as crashed and should be repaired
Запрос:
SELECT uid, username, displaygroup, usergroup, ignorelist, hideemail, receivepms FROM mybb_users WHERE displaygroup IN (3,4,6) OR (displaygroup='0' AND usergroup IN (3,4,6)) OR uid IN (0) ORDER BY username