Invalid argument supplied for foreach()

fixed thanks to stackoverflow.

updated php code will now handle a deselected set

‘$flickr_set = get_field(post_flickr_set);
echo ‘<div #id=”flickr-set” class=”flickr-gallery”>’;
// The foreach() requires an array, so if $flickr_set[‘items’]
// is not an array, foreach() will throw an error
if (isset($flickr_set[‘items’]) && is_array($flickr_set[‘items’])) {
foreach ($flickr_set[‘items’] as $id => $photos) {
foreach ($photos as $photo) {
echo ‘<img src=”‘ . $photo[‘thumb’] . ‘” />‘;
}
}
echo ‘</div><!– end flickr-set –>’;
}’
https://stackoverflow.com/questions/26938406/invalid-argument-supplied-for-foreach-when-deselecting-an-array