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 ('870e6aeaacc3dc944d56f1595a19577a', -1, 1474867851, 1474867851, '36939e1c', -4, 0, 0)

Line : 187
File : sessions.php