diff --git a/lib/PayPal/Common/PayPalResourceModel.php b/lib/PayPal/Common/PayPalResourceModel.php
index 6b40e8f..d1ba0f8 100644
--- a/lib/PayPal/Common/PayPalResourceModel.php
+++ b/lib/PayPal/Common/PayPalResourceModel.php
@@ -41,7 +41,7 @@ class PayPalResourceModel extends PayPalModel implements IResource
 
     public function getLink($rel)
     {
-        if ($this->links) {
+        if (is_array($this->links)) {
             foreach ($this->links as $link) {
                 if ($link->getRel() == $rel) {
                     return $link->getHref();