Google crawl errors

Hello, recently updated komento from free version to pro.

In webmaster tools I see many crawl errors like this:

index.php?option=com_komento&lang=&Itemid=1294, response code 500

When I check page that links to it (for example article without any comments) and when I view page source I see this script:

<script type="text/javascript">

window.kt = {

	"environment": "production",

	"rootUrl": "http://domain.lt",

	"ajaxUrl": "http://domain.lt/index.php?option=com_komento&lang=&Itemid=1294",

	"baseUrl": "http://domain.lt/index.php?option=com_komento&lang=none&Itemid=1294",

	"token": "9d575df822a373780d4fa67ad6c1716a",

	"mobile": false,

	"siteName": "domain.lt",

	"locale": "lt-LT",

	"direction": "ltr"

};

</script>

Is it something you could suggest or its sitemap generating problem? Thank you.