I'm encountering a weird issue when getting featured image urls with wp_get_attachment_image_src. If no featured image has been set, this should return null. However, in this case its returning wp-includes/images/crystal/default.png.

The code I'm using to get the URL is:

$thumb_id = get_post_thumbnail_id();
$thumb_url_array = wp_get_attachment_image_src($thumb_id,'full', true);
$thumb_url = $thumb_url_array[0]

This is happening in WordPress 4.1.

  • 1
    Have you tried disabling all plugins and using a default theme?
    – kraftner
    Jan 23, 2015 at 11:19
  • Yes. It happens in Twenty Fourteen with all plugins disabled. Jan 23, 2015 at 11:30

1 Answer 1


here's the wp_get_attachment_image_scr function:

function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {

    // get a thumbnail or intermediate image if there is one
    if ( $image = image_downsize($attachment_id, $size) )
        return $image;

    $src = false;

    if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
        /** This filter is documented in wp-includes/post.php */
        $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
        $src_file = $icon_dir . '/' . wp_basename($src);
        @list($width, $height) = getimagesize($src_file);
    if ( $src && $width && $height )
        return array( $src, $width, $height );
    return false;

as u can see if 3-rd param is true then it looks in icons dir for that image ( and i assume wp_mime_type_icon returns default.png and some of your plugins add_filter to icon_dir to be wp-includes/images/crystal

Just remove 3-rd parameter in your example: $thumb_url_array = wp_get_attachment_image_src($thumb_id,'full'); and it should return false if no image or image url

  • 1
    Ah Thanks! It was right in front of my face in the Codex as well. Jan 23, 2015 at 11:34

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