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 ('8bf31ff44bcc9bc0bb9836dadc0ad90f', -1, 1506061050, 1506061050, '36e1278e', 20, 0, 0)

Line : 189
File : sessions.php