diff --git a/app/Services/BillDetailService.php b/app/Services/BillDetailService.php
index c1b2d3b..3a57047 100644
--- a/app/Services/BillDetailService.php
+++ b/app/Services/BillDetailService.php
@@ -22,6 +22,7 @@ class BillDetailService
     {
         $items = StoreOrderItemModel::query()
             ->where('bill_id', $bill->id)
+            ->where('quantity', '>', 0)
             ->orderBy('id')
             ->get();
 
@@ -39,6 +40,7 @@ class BillDetailService
     {
         $items = StoreOrderItemModel::query()
             ->whereIn('bill_id', $billIds)
+            ->where('quantity', '>', 0)
             ->orderBy('id')
             ->get();
 
@@ -73,15 +75,14 @@ class BillDetailService
                 $weight = bcadd($weight, (string) $item->weight, 3);
                 $amount = bcadd($amount, (string) $item->amount, 2);
             }
+            $price = bcdiv($amount, (string) $quantity, 2);
 
             $rows[] = [
                 'product_id' => (int) $productId,
                 'product_name' => $first->product_name,
                 'product_spec' => $first->product_spec,
                 'unit' => $first->unit,
-                'price' => $quantity > 0
-                    ? bcdiv($amount, (string) $quantity, 2)
-                    : (string) $first->price,
+                'price' => $price,
                 'quantity' => $quantity,
                 'weight' => $weight,
                 'amount' => $amount,