phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpbb/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 ('6f7ba2a4d485ca51ac69dcd0a1823be7', -1, 1409657621, 1409657621, '36ed7af1', -1, 0, 0)

Line : 187
File : sessions.php