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 ('21ef1ee68ed8600daca365d7c09c9ba8', -1, 1462245300, 1462245300, '36a322ed', 13, 0, 0)

Line : 187
File : sessions.php