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 ('8a4fc1ba3d6e9822fab39b893e024b6b', -1, 1714064871, 1714064871, '12dc516a', 2, 0, 0)

Line : 187
File : sessions.php