Update app.py

app.py

@@ -339,7 +339,7 @@ def add_certified_user(hf_username, first_name, last_name, pass_percentage):
   if not check.empty:
     #print("CHECK", check)
     #print("INDEX", check.index[0])
-    data = data.drop(labels=check.index[0], axis=0)
+    history = history.drop(labels=check.index[0], axis=0)
     #history.iloc[[check.index[0]],['hf_username', 'first_name', 'last_name', 'pass_percentage', 'datetime']] = hf_username, first_name, last_name, pass_percentage, time.time()
   
   new_row = pd.DataFrame({'hf_username': hf_username, 'first_name': first_name, 'last_name': last_name, 'pass_percentage': pass_percentage, 'datetime': time.time()}, index=[0])