@mikejolley probably I’ve found the issue.. I’ve inserted a snippet in the functions.php of the child-theme to defer parsing javascripts as suggested by gtmetrix to speed-up website.. I’ve use a test-site and when I’ve removed the snippet all goes right. The snippet is this, do You think that is possible that this code cause errors..? Thank You very much..:)
/* Defer Javascripts */
/* Defer jQuery Parsing using the HTML5 defer property */
if (!(is_admin() )) {
function defer_parsing_of_js ( $url ) {
if ( FALSE === strpos( $url, '.js' ) ) return $url;
if ( strpos( $url, 'jquery.js' ) ) return $url;
// return "$url' defer ";
return "$url' defer onload='";
}
add_filter( 'clean_url', 'defer_parsing_of_js', 11, 1 );
}
