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 ('d5480af675507e5c0d1a1de197ee0bea', -1, 1711716865, 1711716865, '035509d0', -10, 0, 0)

Line : 187
File : sessions.php