/**
* Transform an array to a serialized string for database storage.
*
- * @param array|NULL $value
- * @param $serializationType
- * @return string|NULL
+ * @param array|null $value
+ * @param int $serializationType
+ * @return string|null
+ *
* @throws \Exception
*/
public static function serializeField($value, $serializationType) {