Index: wp-admin/includes/media.php
===================================================================
--- wp-admin/includes/media.php	(revision 15675)
+++ wp-admin/includes/media.php	(working copy)
@@ -1162,8 +1162,8 @@
 		$thumb_url = false;
 
 	$post = get_post( $attachment_id );
-
-	$default_args = array( 'errors' => null, 'send' => post_type_supports(get_post_type($post->post_parent), 'editor'), 'delete' => true, 'toggle' => true, 'show_title' => true );
+	
+	$default_args = array( 'errors' => null, 'send' => $post->post_parent ? post_type_supports( get_post_type( $post->post_parent ), 'editor' ) : true, 'delete' => true, 'toggle' => true, 'show_title' => true );
 	$args = wp_parse_args( $args, $default_args );
 	extract( $args, EXTR_SKIP );