phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './messageboard/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 ('7891f01668e33b7f950e352d1564ed30', -1, 1455207622, 1455207622, '36a0b121', 1, 0, 0)

Line : 187
File : sessions.php