PHP Notices

Hello!
I’m not sure what was your made you comment out line 812 in includes/class-xmlsitemapfeed.php, but that produces

[24-May-2018 04:27:12 UTC] PHP Notice:  Undefined variable: attachment in /some_path/wp-content/plugins/xml-sitemap-feed/includes/class-xmlsitemapfeed.php on line 818
[24-May-2018 04:27:12 UTC] PHP Notice:  Trying to get property of non-object in /some_path/wp-content/plugins/xml-sitemap-feed/includes/class-xmlsitemapfeed.php on line 818
[24-May-2018 04:27:12 UTC] PHP Notice:  Undefined variable: attachment in /some_path/wp-content/plugins/xml-sitemap-feed/includes/class-xmlsitemapfeed.php on line 819
[24-May-2018 04:27:12 UTC] PHP Notice:  Trying to get property of non-object in /some_path/wp-content/plugins/xml-sitemap-feed/includes/class-xmlsitemapfeed.php on line 819

since $attachment is quite obviously not an object because you commented out code to retrieve it. Please fix it so that I don’t have to with every update. Thank you.