Ticket #22774: 22774.diff

wp-admin/includes/post.php

@@ -235 +235 @@
                         }
                 }
 
-                if ( isset( $post_data['attachments'][ $post_ID ] ) )
-                        $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $post_data['attachments'][ $post_ID ] );
+                $attachment_data = isset( $post_data['attachments'][ $post_ID ] ) ? $post_data['attachments'][ $post_ID ] : array();
+                $post_data = apply_filters( 'attachment_fields_to_save', $post_data, $attachment_data );
         }
 
         add_meta( $post_ID );