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 ('46b80ec5c9b5ad78e1e3e9dd92b37ed5', -1, 1711689887, 1711689887, '03eb915f', -10, 0, 0)

Line : 187
File : sessions.php