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 ('427a8ac1fd47123fa8a18115fc9d9c60', -1, 1711706443, 1711706443, '03edeb94', -11, 0, 0)

Line : 187
File : sessions.php