fix: Fixed enum serialization with null values.

Author: KlebanAndrew

composer.json

@@ -14,7 +14,7 @@
 		"ext-json": "*",
 		"illuminate/support": "^8.0 || ^9.0",
 		"spatie/macroable": "1.0.1",
-		"tenantcloud/php-standard": "^1.2"
+		"tenantcloud/php-standard": "^1.4"
 	},
 	"require-dev": {
 		"phpunit/phpunit": "^9.0",

src/TenantCloud/DataTransferObjects/IsDataTransferObject.php

@@ -94,11 +94,11 @@ public function __unserialize(array $data): void
 
 				if (is_iterable($serializedItem)) {
 					foreach ($serializedItem as $key => $item) {
-						Arr::set($dataItems[$index], $key, $enum::fromValue($item));
+						Arr::set($dataItems[$index], $key, $item === null ? $item : $enum::fromValue($item));
 					}
 				} else {
 					/* @var ValueEnum|null $enum */
-					Arr::set($dataItems, $index, $enum::fromValue($serializedItem));
+					Arr::set($dataItems, $index, $serializedItem === null ? $serializedItem : $enum::fromValue($serializedItem));
 				}
 			}
 		}