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 ('0516e222409966fa2b30e8065b0c9bee', -1, 1714000759, 1714000759, '12dc3b45', -7, 0, 0)

Line : 187
File : sessions.php