Ticket #16224: post-format-classes-2.diff

wp-includes/post-template.php

@@ -331 +331 @@
         // Post Format
         $post_format = get_post_format( $post->ID );
 
-        if ( $post_format && !is_wp_error($post_format) )
-                $classes[] = 'format-' . sanitize_html_class( $post_format );
-        else
-                $classes[] = 'format-standard';
+        if ( post_type_supports( $post->post_type, 'post-formats' ) ) {
+                if ( $post_format && !is_wp_error($post_format) )
+                        $classes[] = 'format-' . sanitize_html_class( $post_format );
+                else
+                        $classes[] = 'format-standard';
+        }
 
         // post requires password
         if ( post_password_required($post->ID) )