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 ('782d980235a012036e6caa4e2f6ff7a5', -1, 1756976793, 1756976793, 'd849d821', 5, 0, 0)

Line : 187
File : sessions.php