diff --git a/src/models/item.js b/src/models/item.js
index cde7b67..c718e94 100644
--- a/src/models/item.js
+++ b/src/models/item.js
@@ -7,12 +7,16 @@ const S3ImageUtils = require('../utils/S3ImageUtils');
 module.exports = {
   insertItem: async function (req) {
     const userId = Number(req.decoded);
-    const folderId = !req.body.folder_id ? null : Number(req.body.folder_id);
+    let folderId = !req.body.folder_id ? null : Number(req.body.folder_id);
     const itemName = trimToString(req.body.item_name);
     const itemPrice = !req.body.item_price ? 0 : req.body.item_price;
     const itemUrl = !req.body.item_url ? null : trimToString(req.body.item_url);
     const itemMemo = trimToString(req.body.item_memo);
 
+    if (isNaN(folderId)) {
+      folderId = null;
+    }
+
     const params = [userId, folderId, itemName, itemPrice, itemUrl, itemMemo];
 
     let sqlInsert;