--- a/lib/openid-php/Auth/OpenID/Server.php
+++ b/lib/openid-php/Auth/OpenID/Server.php
@@ -1704,7 +1704,7 @@
     {
         if (method_exists($this, "openid_" . $request->mode)) {
             $handler = array($this, "openid_" . $request->mode);
-            return call_user_func($handler, &$request);
+            return call_user_func($handler, $request);
         }
         return null;
     }