Update app.py

app.py

@@ -333,7 +333,7 @@ def add_certified_user(hf_username, first_name, last_name, pass_percentage):
   history = pd.read_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME))
   new_row = {'hf_username': hf_username, 'first_name': first_name, 'last_name': last_name, 'pass_percentage': pass_percentage, 'datetime': time.time()}
   new_history = pd.DataFrame(new_row)
-  history = pd.concat([history, new_history])
+  history = pd.concat([history, new_history], ignore_index=True))
   print("HISTORY", history)
   history.to_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME), index=False)
   df.to_csv(os.path.join(CERTIFIED_USERS_DIR, CERTIFIED_USERS_FILENAME), index=False)