diff --git a/lib/PayPal/Handler/RestHandler.php b/lib/PayPal/Handler/RestHandler.php
index ec5298d..6bc55ae 100644
--- a/lib/PayPal/Handler/RestHandler.php
+++ b/lib/PayPal/Handler/RestHandler.php
@@ -82,7 +82,7 @@ class RestHandler implements IPayPalHandler
             $httpConfig->addHeader('Authorization', "Bearer " . $credential->getAccessToken($config), false);
         }
 
-        if ($httpConfig->getMethod() == 'POST' || $httpConfig->getMethod() == 'PUT') {
+        if (($httpConfig->getMethod() == 'POST' || $httpConfig->getMethod() == 'PUT') && !is_null($this->apiContext->getRequestId())) {
             $httpConfig->addHeader('PayPal-Request-Id', $this->apiContext->getRequestId());
         }
         // Add any additional Headers that they may have provided