@RushV

Как убрать эту ошибку Warning: Illegal string offset 'url' in?

Все привет!
Стоит движок вордпресс.
Создал мета бокс (ы) :
function add_custom_meta_boxes() {
 
    // Define the custom attachment for posts
    add_meta_box(
        'wp_custom_attachment',
        'Фон загаловка страницы',
        'wp_custom_attachment',
        'post',
        'normal'
    );
     
    // Define the custom attachment for pages
    add_meta_box(
        'wp_custom_attachment',
        'Фон загаловка страницы',
        'wp_custom_attachment',
        'page',
        'normal'
    );
 
} // end add_custom_meta_boxes
add_action('add_meta_boxes', 'add_custom_meta_boxes');

function wp_custom_attachment() {
 
    wp_nonce_field(plugin_basename(__FILE__), 'wp_custom_attachment_nonce');
	    
	$doc = get_post_meta(get_the_ID(), 'wp_custom_attachment', true);	
    $html = '<p class="description">';
    $html .= 'Upload your jpg here.';
    $html .= '</p>';
	$html = '<div class="wp_custom_attachment_img">';
	if(empty($doc)){
	$html .= '<input type="file" id="wp_custom_attachment" name="wp_custom_attachment" value="" size="25" />';
	} 
    $html .= '<input type="text" id="wp_custom_attachment_url" name="wp_custom_attachment_url" value="'. $doc['url'] .'" size="150" />';
	$html .= '<a href="javascript:;" id="wp_custom_attachment_delete">' . __('<i class="glyphicon glyphicon-remove-circle"></i>') . '</a>'; 
	$html .= '<img src="'. $doc['url'] .'" id="wp_custom_attachment_url wp_custom_attachment_img" />';
	$html .= '</div>';
	
		
	
    echo $html;	
	
	
	
 
} // end wp_custom_attachment

function save_custom_meta_data($id) {
 
    /* --- security verification --- */
    if(!wp_verify_nonce($_POST['wp_custom_attachment_nonce'], plugin_basename(__FILE__))) {
      return $id;
    } // end if
       
    if(defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
      return $id;
    } // end if
       
    if(!current_user_can('edit_page', $id)) {
        return $id;
    } // end if
    /* - end security verification - */
     
    // Make sure the file array isn't empty
    if(!empty($_FILES['wp_custom_attachment']['name'])) {
         
        // Setup the array of supported file types. In this case, it's just PDF.
        $supported_types = array('image/jpeg');
         
        // Get the file type of the upload
        $arr_file_type = wp_check_filetype(basename($_FILES['wp_custom_attachment']['name']));
        $uploaded_type = $arr_file_type['type'];
         
        // Check if the type is supported. If not, throw an error.
        if(in_array($uploaded_type, $supported_types)) {
 
            // Use the WordPress API to upload the file
            $upload = wp_upload_bits($_FILES['wp_custom_attachment']['name'], null, file_get_contents($_FILES['wp_custom_attachment']['tmp_name']));
     
            if(isset($upload['error']) && $upload['error'] != 0) {
                wp_die('There was an error uploading your file. The error is: ' . $upload['error']);
            } else {
               $upload['file'] = str_replace('\\', '/', $upload['file']);
			   add_post_meta($id, 'wp_custom_attachment', $upload);
			   update_post_meta($id, 'wp_custom_attachment', $upload);
			   add_post_meta($id, 'wp_custom_attachment_url', $_POST['wp_custom_attachment_url']);
			   update_post_meta($id, 'wp_custom_attachment_url', $_POST['wp_custom_attachment_url']);    
            } // end if/else
 
        } else {
            wp_die("The file type that you've uploaded is not a PDF.");
        } // end if/else
         
    } else {
 
        // Grab a reference to the file associated with this post
        $doc = get_post_meta($id, 'wp_custom_attachment', true);
         
        // Grab the value for the URL to the file stored in the text element
        $delete_flag = get_post_meta($id, 'wp_custom_attachment_url', true);
         
        // Determine if a file is associated with this post and if the delete flag has been set (by clearing out the input box)
        if(strlen(trim($doc['url'])) > 0 && strlen(trim($delete_flag)) == 0) {
         
            // Attempt to remove the file. If deleting it fails, print a WordPress error.
            if(unlink($doc['file'])) {
                 
                // Delete succeeded so reset the WordPress meta data
                update_post_meta($id, 'wp_custom_attachment', null);
                update_post_meta($id, 'wp_custom_attachment_url', '');
                 
            } else {
                wp_die('There was an error trying to delete your file.');
            } // end if/el;se
             
        } // end if
 
    } // end if/else
     
} // end save_custom_meta_data
add_action('save_post', 'save_custom_meta_data');

function update_edit_form() {
    echo ' enctype="multipart/form-data"';
} // end update_edit_form
add_action('post_edit_form_tag', 'update_edit_form');

Вывел картинку на страницу вот так:
<?php $doc = get_post_meta(get_the_ID(), 'wp_custom_attachment', true); ?>
	<?php echo $doc['url']; ?>


всё работает, но при создании новой страницы появляется ошибка "Warning: Illegal string offset 'url' in" если добавить фото и перезагрузить страницу то надпись пропадает.
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