diff --git a/src/Message/AbstractResponse.php b/src/Message/AbstractResponse.php
index 34556cb..dcf5ac8 100644
--- a/src/Message/AbstractResponse.php
+++ b/src/Message/AbstractResponse.php
@@ -209,7 +209,8 @@ public function getTransactionReference()
 
     public function getMessage()
     {
-        $codes = explode(',', $this->getCode());
+
+        $codes = $this->getCode() && is_array($this->getCode()) ? explode(',', $this->getCode()) : [];
         $messages = array();
 
         foreach ($codes as $code) {