diff --git a/app/Service/Api/Order/OrderInfoService.php b/app/Service/Api/Order/OrderInfoService.php
index ca02a98..0010a68 100644
--- a/app/Service/Api/Order/OrderInfoService.php
+++ b/app/Service/Api/Order/OrderInfoService.php
@@ -160,7 +160,7 @@ class OrderInfoService extends BaseService
             $boxNum = 0;
             if (!empty($pickupCodeOneCopies)) {
                 $pickupCodeOneCopiesArr = explode('-', $pickupCodeOneCopies);
-                $boxNum = ceil(end($pickupCodeOneCopiesArr) ?? '0' / (int)$this->configCache->getConfigValueByKey(ConfigCode::MAXIMUM_VALUE_IN_FULL_BOX));
+                $boxNum = ceil(end($pickupCodeOneCopiesArr) ?? 0 / (int)$this->configCache->getConfigValueByKey(ConfigCode::MAXIMUM_VALUE_IN_FULL_BOX));
             }
 
             $oneCopiesInfo = [
diff --git a/app/Service/Api/Order/OrderListService.php b/app/Service/Api/Order/OrderListService.php
index 602fdd5..692c980 100644
--- a/app/Service/Api/Order/OrderListService.php
+++ b/app/Service/Api/Order/OrderListService.php
@@ -184,7 +184,7 @@ class OrderListService extends BaseService
                 $boxNum = 0;
                 if (!empty($pickupCodeOneCopies)) {
                     $pickupCodeOneCopiesArr = explode('-', $pickupCodeOneCopies);
-                    $boxNum = ceil(end($pickupCodeOneCopiesArr) ?? '0' / (int)$this->configCache->getConfigValueByKey(ConfigCode::MAXIMUM_VALUE_IN_FULL_BOX));
+                    $boxNum = ceil(end($pickupCodeOneCopiesArr) ?? 0 / (int)$this->configCache->getConfigValueByKey(ConfigCode::MAXIMUM_VALUE_IN_FULL_BOX));
                 }
                 $oneCopiesInfo = [
                     'total_price' => '0.00',