diff --git a/mobile/shop/orderform.php b/mobile/shop/orderform.php
index 5d0f4eb58..11ebff5cb 100644
--- a/mobile/shop/orderform.php
+++ b/mobile/shop/orderform.php
@@ -909,6 +909,10 @@ $(function() {
         $("#od_coupon_frm").remove();
         var $this = $(this);
         var price = parseInt($("input[name=org_od_price]").val()) - parseInt($("input[name=item_coupon]").val());
+        if(price <= 0) {
+            alert('상품금액이 0원이므로 쿠폰을 사용할 수 없습니다.');
+            return false;
+        }
         $.post(
             "./ordercoupon.php",
             { price: price },
diff --git a/shop/ordercoupon.php b/shop/ordercoupon.php
index 2a24a1e33..c64a27a18 100644
--- a/shop/ordercoupon.php
+++ b/shop/ordercoupon.php
@@ -4,7 +4,10 @@ include_once('./_common.php');
 if($is_guest)
     exit;
 
-$price = $_POST['price'];
+$price = (int)$_POST['price'];
+
+if($price <= 0)
+    echo '상품금액이 0원이므로 쿠폰을 사용할 수 없습니다.';
 
 // 쿠폰정보
 $sql = " select *
diff --git a/shop/orderform.php b/shop/orderform.php
index 1e736968e..cc3f2c47b 100644
--- a/shop/orderform.php
+++ b/shop/orderform.php
@@ -1172,6 +1172,10 @@ $(function() {
         $("#od_coupon_frm").remove();
         var $this = $(this);
         var price = parseInt($("input[name=org_od_price]").val()) - parseInt($("input[name=item_coupon]").val());
+        if(price <= 0) {
+            alert('상품금액이 0원이므로 쿠폰을 사용할 수 없습니다.');
+            return false;
+        }
         $.post(
             "./ordercoupon.php",
             { price: price },