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 ('17047b6a0f1c7ca55d0006aa62f3eddc', -1, 1488127714, 1488127714, '3690c2a1', -1, 0, 0)

Line : 187
File : sessions.php