diff --git a/src/Call/PaymentResponse.php b/src/Call/PaymentResponse.php
index 1b8dd04..db75b21 100644
--- a/src/Call/PaymentResponse.php
+++ b/src/Call/PaymentResponse.php
@@ -28,7 +28,7 @@ public function __construct(
 	public static function createFromResponseData(array $data): self
 	{
 		return new self(
-			$data['payId'],
+			$data['payId'] ?? '', // for some error response it can be null
 			DateTimeImmutable::createFromFormat('YmdHis', $data['dttm']),
 			ResultCode::from($data['resultCode']),
 			$data['resultMessage'],