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 ('8d663d3c8e74413c92511b8e4ea5384d', -1, 1711723515, 1711723515, '171617a2', -4, 0, 0)

Line : 187
File : sessions.php