Ticket #3979: patch.diff

wp-includes/classes.php

@@ -149 +149 @@
                         elseif (!empty($perma_query_vars[$wpvar]))
                                 $this->query_vars[$wpvar] = $perma_query_vars[$wpvar];
 
-                        $this->query_vars[$wpvar] = (string) $this->query_vars[$wpvar];
+                        if( empty( $this->query_vars[$wpvar] ) == false )
+                                $this->query_vars[$wpvar] = (string) $this->query_vars[$wpvar];
                 }
 
                 foreach ($this->private_query_vars as $var) {