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 ('93f7b96c197ab12ee1f023e3ac9fc4f9', -1, 1508462637, 1508462637, '36a7fa40', 19, 0, 0)

Line : 186
File : sessions.php