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  • You need to add a conditional statement around your code so that it is not called if there are no images.

    
    <?php 
    $image_ids = get_field('gallery', false, false);
    if (is_array($image_ids)) {
        $shortcode = '[gallery ids="' . implode(',', $image_ids) . '"]';
        echo do_shortcode( $shortcode );
    }
    ?>