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 ('7759efd3947dfb6220c9372f2f7727bc', -1, 1714044109, 1714044109, '12758940', -9, 0, 0)

Line : 187
File : sessions.php