Hi @inhouse
It seems that one of the slideshow images is empty, so it shows a broken page. Could you please try the following code?
foreach( $pages as $page ) {
// Child page gallery images
$slideshow_images = get_field('slideshow_images', $page->ID);
if( $slideshow_images ){
$images = array_merge($images, $slideshow_images);
}
}
Thanks 🙂
edit: change $slideshow
to $slideshow_images
. Thanks to @inhouse.