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 ('cc68fdd4d78101568ebd3939e6f14c58', -1, 1518931343, 1518931343, '36f25ecc', -4, 0, 0)

Line : 187
File : sessions.php