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 ('0c37a8fc4905b6f213a2044b10821aff', -1, 1714021964, 1714021964, '0389aab7', -4, 0, 0)

Line : 187
File : sessions.php