phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('994e591d39a08d59fd95a8de80c7f59d', -1, 1540271656, 1540271656, '36e0387e', 18, 0, 0)

Line : 187
File : sessions.php