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 ('1cdf3494aee126971cdc8e815815dd7f', -1, 1714616012, 1714616012, '1275d8e5', -9, 0, 0)

Line : 187
File : sessions.php