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 ('5dd88956c9beaea2d86583e99f4e426d', -1, 1438532616, 1438532616, '36e365d6', -1, 0, 0)

Line : 187
File : sessions.php