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 ('9fa21c835448f2fcbe3d0d34f45514d4', -1, 1511342200, 1511342200, '3691753c', 4, 0, 0)

Line : 187
File : sessions.php