phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './shelter/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('a85b4e9648baf5e95a5ad23a61fffe6a', -1, 1464569929, 1464569929, '36e09447', 0, 0, 0)

Line : 187
File : sessions.php