diff --git a/src/Webpay/TransaccionCompleta/Responses/MallTransactionStatusResponse.php b/src/Webpay/TransaccionCompleta/Responses/MallTransactionStatusResponse.php
index 5b5adea0..2383f4e1 100644
--- a/src/Webpay/TransaccionCompleta/Responses/MallTransactionStatusResponse.php
+++ b/src/Webpay/TransaccionCompleta/Responses/MallTransactionStatusResponse.php
@@ -19,7 +19,7 @@ public function __construct(array $json)
         $this->accountingDate = Utils::returnValueIfExists($json, 'accounting_date');
         $this->transactionDate = Utils::returnValueIfExists($json, 'transaction_date');
         $this->cardDetail = Utils::returnValueIfExists($json, 'card_detail');
-        $this->cardNumber = Utils::returnValueIfExists($this->cardDetail, 'card_number');
+        $this->cardNumber = Utils::returnValueIfExists($this->cardDetail ?? [], 'card_number');
 
         $this->details = [];
         if (is_array($json['details'])) {