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 ('8126482ff02712e10a7b5cda4a823947', -1, 1714002043, 1714002043, '03900ccd', -4, 0, 0)

Line : 187
File : sessions.php