Ticket #15322: 15322.patch

post-template.php

@@ -344 +344 @@
         $classes[] = 'hentry';
 
         // Categories
-        foreach ( (array) get_the_category($post->ID) as $cat ) {
-                if ( empty($cat->slug ) )
-                        continue;
-                $classes[] = 'category-' . sanitize_html_class($cat->slug, $cat->cat_ID);
+        if( is_object_in_taxonomy( $post->post_type, 'category' ) ) {
+                foreach ( (array) get_the_category($post->ID) as $cat ) {
+                        if ( empty($cat->slug ) )
+                                continue;
+                        $classes[] = 'category-' . sanitize_html_class($cat->slug, $cat->cat_ID);
+                }
         }
 
         // Tags
-        foreach ( (array) get_the_tags($post->ID) as $tag ) {
-                if ( empty($tag->slug ) )
-                        continue;
-                $classes[] = 'tag-' . sanitize_html_class($tag->slug, $tag->term_id);
+        if( is_object_in_taxonomy( $post->post_type, 'post_tag' ) ) {
+                foreach ( (array) get_the_tags($post->ID) as $tag ) {
+                        if ( empty($tag->slug ) )
+                                continue;
+                        $classes[] = 'tag-' . sanitize_html_class($tag->slug, $tag->term_id);
+                }
         }
 
         if ( !empty($class) ) {