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 ('a5a1899538d4eec302d6a8e95c0c4b65', -1, 1398066317, 1398066317, '36cdcd2f', -1, 0, 0)

Line : 187
File : sessions.php