phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './db_lets5/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f7d1fe580157fe3f97e99103d70b3763', -1, 1438445331, 1438445331, '36537e9b', 3, 0, 0)

Line : 220
File : sessions.php