: Invalid argument supplied for foreach() in - php

Question

tried this code on two different WordPress sites. It was working on the first site. After I moved the template completely to my new site, I got this error: Invalid argument supplied for foreach() in
I do not know what is the reason, although it is the same template, plugins and everything
<?php
$novoteste = new ComicLatestChapters("6", "6");
$resultados = $novoteste->filter;
foreach($resultados as $resultado => $novoteste) {
$series_id = $novoteste->post_id;
$status = get_post_status($series_id);
if($status !== 'publish' || $series_id == 20305){
continue;
}
$result = get_post($resultado);
$sort_by = $sort_setting['sortBy'];
$sort_order = $sort_setting['sort'];
$chapters = $wp_manga_functions->get_latest_chapters($series_id, null, 2, 0, $sort_by, $sort_order);
$latest_chapter = $chapters[0];
$semilatest_chapter = $chapters[1];
$scheduled1 = $latest_chapter['schedule_time'];
$scheduled2 = $semilatest_chapter['schedule_time'];
$series_link = get_the_permalink($series_id);
$chapter_slug1 = $latest_chapter['chapter_slug'];
$chapter_slug2 = $semilatest_chapter['chapter_slug'];
$type = $wp_manga_functions->get_manga_type( $manga_id );
$chapter_name1 = $latest_chapter['chapter_name'];
$chapter_name2 = $semilatest_chapter['chapter_name'];
$mass_released = is_mass_released($series_id);
$ch_1 = get_only_numbers($chapter_name1);
$ch_2 = get_only_numbers($chapter_name2);
$rating = get_post_meta($series_id, '_manga_avarage_reviews', true);
$chapter_index1 = $latest_chapter['chapter_index'];
$chapter_index2 = $semilatest_chapter['chapter_index'];
$link1 = $wp_manga_functions->build_chapter_url($series_id, $chapter_slug1);
$link2 = $wp_manga_functions->build_chapter_url($series_id, $chapter_slug2);
$restored = get_post_meta($series_id, 'restored', true);
$publish = $latest_chapter['date'];
$publish2 = $semilatest_chapter['date'];
$type = get_post_meta($series_id, '_wp_manga_chapter_type', true);
$series_status = get_post_meta($series_id, '_wp_manga_status', true);
if (isset($scheduled1)){
$published = $wp_manga_functions->get_time_diff($scheduled1);}
else{
$published = $wp_manga_functions->get_time_diff($publish);
}
if (isset($scheduled2)){
$published2 = $wp_manga_functions->get_time_diff($scheduled2);}
else{
$published2 = $wp_manga_functions->get_time_diff($publish2);
}
$series_class = get_post_meta($series_id, 'manga_custom_badges', true);
$class_css = str_replace(' ', '-', strtolower($series_class));
$novel1 = get_post($series_id);
$title = $novel1->post_title;
$description = $result->post_content;
$thumbnail_id = get_post_meta($series_id, '_thumbnail_id', true);
$thumbnail_link = get_the_post_thumbnail_url($series_id, array(290,395));
?>

Answer 1

You should check that the output $resultados = $novoteste->filter; Is it empty or not?
The code changes like this:
<?php
$novoteste = new ComicLatestChapters( "6", "6" );
$resultados = $novoteste->filter ?: array();
foreach( $resultados as $resultado => $novoteste ) {
........
}