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 ('d6f1b9c4017951e085ff943aa4a3cb95', -1, 1475119962, 1475119962, '36eb2ea4', 26, 0, 0)

Line : 187
File : sessions.php