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 ('fadb58c72b97cd7c9a9263d9da1f5afd', -1, 1714006781, 1714006781, '0390ac73', -7, 0, 0)

Line : 187
File : sessions.php