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 ('6dfb2f6669b34de29b882f49cf4a70a2', -1, 1714023715, 1714023715, '12dc6af1', -4, 0, 0)

Line : 187
File : sessions.php