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 ('df4bcb6f07493570f59d19b2f62340ba', -1, 1438236418, 1438236418, '36f23fd6', -1, 0, 0)

Line : 187
File : sessions.php