phpBB : Kritischer Fehler

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, is_robot, session_admin) VALUES ('c5f0fb29bca64e3e241f0308e4098d7b', -1, 1519199872, 1519199872, '3690549b', 1, 0, '0', 0)

Line : 190
File : sessions.php