Ticket #25429: 25429.diff

wp-includes/category-template.php

@@ -136 +136 @@
 function get_the_category_by_ID( $cat_ID ) {
         $cat_ID = (int) $cat_ID;
         $category = get_category( $cat_ID );
-        if ( is_wp_error( $category ) )
+        if ( null === $category || is_wp_error( $category ) )
                 return $category;
         return $category->name;
 }

wp-includes/category.php

@@ -80 +80 @@
  */
 function get_category( $category, $output = OBJECT, $filter = 'raw' ) {
         $category = get_term( $category, 'category', $output, $filter );
-        if ( is_wp_error( $category ) )
+        if ( null === $category || is_wp_error( $category ) )
                 return $category;
 
         _make_cat_compat( $category );