From 33ef42de9afaa7999a35df2e97d616f3190a136f Mon Sep 17 00:00:00 2001
From: Villermen <villermen@gmail.com>
Date: Mon, 20 Jul 2020 01:23:57 +0200
Subject: [PATCH] Don't fail Parcel::toArray() when label URLs are not
 available

Closes #4.
---
 src/Model/Parcel.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Model/Parcel.php b/src/Model/Parcel.php
index acf0c74..126524f 100644
--- a/src/Model/Parcel.php
+++ b/src/Model/Parcel.php
@@ -296,7 +296,7 @@ public function toArray(): array
             'carrier' => $this->getCarrier(),
             'created' => $this->getCreated()->format(DATE_ISO8601),
             'id' => $this->getId(),
-            'labels' => array_map(function (int $format): string {
+            'labels' => array_map(function (int $format): ?string {
                 return $this->getLabelUrl($format);
             }, self::LABEL_FORMATS),
             'orderNumber' => $this->getOrderNumber(),