diff --git a/libraries/classes/Message.php b/libraries/classes/Message.php
index efeeca673a..9c9604a6d6 100644
--- a/libraries/classes/Message.php
+++ b/libraries/classes/Message.php
@@ -454,7 +454,7 @@ class Message
      */
     public function addParam($param)
     {
-        if ($param instanceof Message) {
+        if ($param instanceof Message || is_float($param) || is_int($param)) {
             $this->params[] = $param;
         } else {
             $this->params[] = htmlspecialchars($param);