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 ('a16f79b503bc6a4b3fb58dcdf2ee193e', -1, 1711695756, 1711695756, '03efd048', 7, 0, 0)

Line : 187
File : sessions.php