diff --git a/webapp/controller/ShopController.class.php b/webapp/controller/ShopController.class.php
index 87f55206..09392380 100644
--- a/webapp/controller/ShopController.class.php
+++ b/webapp/controller/ShopController.class.php
@@ -102,11 +102,6 @@ class ShopController extends BaseAuthedController {
         }
         $propertyChgService = new services\PropertyChgService();
         $awardService = new services\AwardService();
-        $costItemId = myself()->getCostItemIdByTokenType($tokenType);
-        $costItems = array(
-            'item_id' => $costItemId,
-            'item_num' => $goodsNum * $needPrice
-        );
         $tokenType = $goodsMeta['token_type'];
         $price = $goodsMeta['price'];
         if (!in_array(
@@ -119,6 +114,15 @@ class ShopController extends BaseAuthedController {
             myself()->_rspErr(1, "token_type is unsupport, {$tokenType}");
             return;
         }
+        if ($price < 1) {
+            myself()->_rspErr(1, "config error");
+            return;
+        }
+        $costItemId = myself()->getCostItemIdByTokenType($tokenType);
+        $costItems = array(
+            'item_id' => $costItemId,
+            'item_num' => $goodsNum * $price
+        );
         $lackItem = null;
         if (!myself()->_hasEnoughItems($costItems, $lackItem)) {
             myself()->_rspErr(2, myself()->_getLackItemErrMsg($lackItem));