invalid argument supplied for foreach()

I am new to having issues with our WordPress site. I am having an issue with the Geodirectory plugin. The full error messages on one of the pages is Warning: Invalid argument supplied for foreach() in /home/growwi8/public_html/wp-content/plugins/geodirectory/geodirectory-functions/taxonomy_functions.php on line 1771

The actual code is…

foreach ($a_terms as $pt => $t2) {
            foreach ($t2 as $term) {
                $term_icon = get_tax_meta ($term->term_id, 'ct_cat_icon', false, $pt);
                if ($term_icon) {
                    $term_icon_url = $term_icon["src"];
                } else {
                    $term_icon_url = $default_icon_url;
                }
                $terms_icons[$term->term_id] = $term_icon_url;
            }
        }

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