Sitemap Generator Forum

Hi, how I can fix this PHP Warning (see Attach Pic)

php -v
PHP 7.4.3 (cli) (built: Feb 23 2020 07:24:02) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Zend OPcache v7.4.3, Copyright (c), by Zend Technologies

Standalone Sitemap Generator (PHP)
v8.0, 2018-05-17
Thx
Rg
Exact

Hello,

this is a notice message and can be ignored.