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 ('d4a9b00de4c77c657af442d55788c5eb', -1, 1714037617, 1714037617, '03912ffd', -2, 0, 0)

Line : 187
File : sessions.php