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 ('7b26bf8c4db31b6e7282fc6d3f1efc8c', -1, 1714031967, 1714031967, '0387cae0', -6, 0, 0)

Line : 187
File : sessions.php