Ticket #36529: 36529.2.patch

link-template.php

@@ -190 +190 @@
                         // having to assign it explicitly
                         if ( empty($category) ) {
                                 $default_category = get_term( get_option( 'default_category' ), 'category' );
-                                $category = is_wp_error( $default_category ) ? '' : $default_category->slug;
+                                if ( isset($category) && ! is_wp_error( $default_category ))
+                                        $category = $default_category->slug;
+                                else 
+                                        $category = '';
                         }
                 }