drupal:不允许序列化"關闭"

提交Review的付款详细資訊後，在... / checkout / ID / order_information頁面上出現以下錯誤。

Exception: Serialization of 'Closure' is not allowed in serialize() (line 14 of core/lib/Drupal/Component/Serialization/PhpSerialize.php).

我試圖用 try/catch捕获異常   阻止，但如果我未選中付款資訊表單中的我的账單資訊与我的送货資訊複選框一樣，它始终会帶来致命錯誤。

我正在使用我的自定義付款方式模組进行付款.我應该在哪裏尋找匯致致命錯誤的原因？

__ construct（）方法：-

public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, PaymentTypeManager $payment_type_manager, PaymentMethodTypeManager $payment_method_type_manager, TimeInterface $time) {
parent::__construct($configuration, $plugin_id, $plugin_definition, $entity_type_manager, $payment_type_manager, $payment_method_type_manager, $time);
  if ($this->getMode() === 'test') {
    $url = "url given here";
  }
  else {
    $url = "url given here";
  }
  try {
    $this->soapClient = new SoapClient($url);
  }
  catch (SoapFault $e) {
    throw new PaymentGatewayException($e->getMessage());
  }
}