fix: 支付宝退款: 发客人邮件

webht/third_party/pay/controllers/AlipayTradeService.php

@@ -782,7 +782,7 @@ class AlipayTradeService extends CI_Controller
             $opi_email_list = explode(";", $advisor_detail->email); // 解析外联的邮件
             $c_fromEmail = trim($opi_email_list[0]);
             $c_toName = $customer_detail->fullname;
-            $c_toEmail = $customer_detail->email;
+            $c_toEmail = isset($customer_detail->email) ? $customer_detail->email : '';
             $c_subject = $currencyCode . " " . str_replace('-', '', $item->ALI_orderAmount) . " Refunded to your account, booking number " . $item->ALI_orderId;
             // 修改一些字段名, 为了和iPaylinks等用同一个邮件模板
             $item->payer = $customer_detail->fullname;