Fixed issue #12295 - https://github.com/cakephp/cakephp/issues/12295

src/Routing/Route/RedirectRoute.php

@@ -88,7 +88,7 @@ class RedirectRoute extends Route
                     }
                 }
             }
-            $redirect = Router::reverse($redirect);
+            $redirect = Router::reverseToArray($redirect);
         }
         $status = 301;
         if (isset($this->options['status']) && ($this->options['status'] >= 300 && $this->options['status'] < 400)) {