Can not create sitemap with version 7.2

[chrissonia1]

If I want to create a sitemap, it is finished after 1 sec.
I go to analyze is the following
Warning: ksort () expects parameter 1 to be array, null given in /www/htdocs/w016e36b/generator/pages/page-analyze.inc.php on line
Warning: Invalid argument supplied for foreach () in /www/htdocs/w016e36b/generator/pages/page-analyze.inc.php on line 120

With the Free generator everything works

[XML-Sitemaps Support]

Hello,

please check that your website is crawlable using our search engine bot simulator tool:
https://www.xml-sitemaps.com/se-bot-simulator.html

[chrissonia1]

Is free and I could create with the free generator a sitemap

[XML-Sitemaps Support]

Hello,

please let me know your generator URL/login in private message to check this.

[XML-Sitemaps Support]

Update: changing starting URL from http to https link resolved the issue.

[chrissonia1]

I think I need glasses! 
Thank you for your support