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 ('4e1875445573fcd7ec93e8434412c8ce', -1, 1714003210, 1714003210, '0315f82f', 3, 0, 0)

Line : 187
File : sessions.php