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 ('b6715c67df2d0202f4f7b0e6f9b41586', -1, 1714267347, 1714267347, '0a020003', -9, 0, 0)

Line : 187
File : sessions.php