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 ('6435dd1de0879298e8a7a7f8a04fcc2f', -1, 1711696552, 1711696552, '03ec5104', 3, 0, 0)

Line : 187
File : sessions.php