Warning: DOMDocument::loadHTML(): Empty string supplied as input

Hi, I’m struggling to replicate this issue on my test site.

I have a page that I used to test the ‘Lazy Load’ functionality:
https://edgewebpages.com/test-page/
(this slider has the ‘Enable Lazy Load Images’ option selected)

I enabled ‘Debug Display’ in my ‘wp-config.php’ file:

define('WP_DEBUG', true);
define('WP_DEBUG_DISPLAY', true);

I got no errors displayed.

I then thought that maybe this error might occur with slides that contained no images, so I added a slide containing only text. Still no errors.

The line you are getting errors on is the PHP function ‘loadHTML’:
$dom->loadHTML(mb_convert_encoding($slide_content, 'HTML-ENTITIES', 'UTF-8'));
which loads a provided string into a previously defined DOM object.

Maybe this PHP function doesn’t work properly on certain versions of PHP. I have PHP version 5.6 running on my hosting – what version of PHP is your host running?

Hi, thank you for fast & detailed reply!
My website runs on PHP 5.6 too + https (SSL).

After reading your reply I enabled “Other Settings ==> DOMContentLoaded event:”, but the error still appears.

Every slide is an image (as a slide background), and no content in the slides` visual editor.

The page with slider is in the first post (under construction)