phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1194 Table '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 ('4851ff01b3c0d84bec02e69f2416bfac', -1, 1406229639, 1406229639, '36e0ca6d', -4, 0, 0)

Line : 187
File : sessions.php