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 ('75756e9bd2d57685f87d245cfcbf50a6', -1, 1518931299, 1518931299, '36f25ecc', 15, 0, 0)

Line : 187
File : sessions.php