I am using meta-boxes to upload files then looping through them and displaying them on the front-end. When I remove a file from the meta-box it is still in the loop and results in a Notice: Trying to get property of non-object.

here is my code
//the piklist meta-box

piklist('field', array(
  'type' => 'file',
  'field' => 'services_media',
  'scope' => 'post_meta',
  'label' => __('Add Services Pictures','piklist'),
  'description' => __('Upload Pictures for Services.','piklist'),
  'help' => 'Upload image(s) to feature in the services section.',
  'options' => array(
    'modal_title' => __('Add Logos','piklist'),
    'button' => __('Add','piklist')
  ),
  'add_more' => false
));

//the loop

$image_ids = get_post_meta($post->ID, 'services_media');
// loop through images and display them
foreach ($image_ids as $image) {
// get values of image
  $img = get_post($image);
  $title = $img->post_title;
  $caption = $img->post_excerpt;
  $alttext = trim(strip_tags( get_post_meta($image, '_wp_attachment_image_alt', true) ));
  $description = $img->post_content;
// print out image
  echo '<div class="small-12 medium-4 column '.$caption.'"><img src="' . wp_get_attachment_url($image) . '" alt="'. $alttext . '" /><p>'.$caption.'</p></div>';
					}