phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table '.\head_f\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 ('afb6b2cf11b7a6e5d0d2a2c87fee06dd', -1, 1493248753, 1493248753, '36c68fdf', -4, 0, 0)

Line : 187
File : sessions.php