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 ('55deba50c9c63c2a27455e38c9f3ba7b', -1, 1406608596, 1406608596, '3653ec38', -1, 0, 0)

Line : 187
File : sessions.php