diff --git a/pos-frontend/__test__/db.test.ts b/pos-frontend/__test__/db.test.ts
index e999313..1c4e9f9 100644
--- a/pos-frontend/__test__/db.test.ts
+++ b/pos-frontend/__test__/db.test.ts
@@ -14,8 +14,9 @@ describe('DATABASE', () => {
   })
 
   it('create csv', () => {
-    let res = create_csv_database('csv_db/x.csv', { "a_key": [], "a_value": [] })
+    let res = create_csv_database('csv_db/x.csv', { "a_key": ['initial'], "a_value": [''] })
     print_head(res)
+    delete_row_by_key(res, "initial", "a_key")
 
     add_row(res, { "a_key": ["x"], "a_value": ["y"] })
     print_head(res)
diff --git a/pos-frontend/app/database.ts b/pos-frontend/app/database.ts
index d271b9c..a5e792a 100644
--- a/pos-frontend/app/database.ts
+++ b/pos-frontend/app/database.ts
@@ -17,7 +17,7 @@ export function save_db(db: CSVDatabase) {
 }
 
 export function add_row(db: CSVDatabase, row: any) {
-  let d = DataFrame([row])
+  let d = DataFrame(row)
   db.df = db.df.vstack(d)
 }
 
diff --git a/pos-frontend/app/model.tsx b/pos-frontend/app/model.tsx
index ad5920d..530d057 100644
--- a/pos-frontend/app/model.tsx
+++ b/pos-frontend/app/model.tsx
@@ -42,7 +42,6 @@ export function create_inventory_dataframe(inventories: Inventory[]): CSVDatabas
   return create_csv_database(filepath, inventories)
 }
 
-
 function create_models() {
   const items: Item[] = [
     { id: '1', name: 'Item 1', price: 100 },
diff --git a/pos-frontend/csv_db/x.csv b/pos-frontend/csv_db/x.csv
index 37bd13c..26a91ea 100644
--- a/pos-frontend/csv_db/x.csv
+++ b/pos-frontend/csv_db/x.csv
@@ -1 +1,2 @@
 a_key,a_value
+x,y