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 ('d84e20b49b7d1f99fb7b2024e5f60594', -1, 1714008977, 1714008977, '12e00019', -4, 0, 0)

Line : 187
File : sessions.php