phpBB : Critical Error

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, session_admin) VALUES ('490a2437e61776ac2ae66d26b646877e', -1, 1711701488, 1711701488, '03e693e1', -11, 0, 0)

Line : 187
File : sessions.php