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 ('6481b3db9c3d59be6f1a7153f172275c', -1, 1498367914, 1498367914, '36c6976c', -4, 0, 0)

Line : 187
File : sessions.php