phpBB : Kritischer Fehler

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_deu_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('a82c6607f1e4be9a32dc5c8c7d240c91', -1, 1427893773, 1427893773, '36a787f7', 12, 0, 0)

Line : 187
File : sessions.php