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 ('46467d0a855a1006d971e4f48f994cd6', -1, 1714018865, 1714018865, '03854f46', -4, 0, 0)

Line : 187
File : sessions.php