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 ('b505a01cf5f13387eb36c29e8819dc59', -1, 1438482988, 1438482988, '3653439e', 15, 0, 0)

Line : 187
File : sessions.php