Use Asynchronous Validation after Submitting a Form in redux-form

Hi, How to avoid double entry of data when there is network issue or some other issue like user clicking a lot of times and creates same form many times? Thanks

const onSubmit = async(values)=>{ const data = {service, email};

const response = await axios({
    method: 'post',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    //url: 'https://wwww.afghanconsulate-munich.com/terminserver/sendemail.php',
    url: config.apiEndPoint+'/hasactiveappointment.php',
    data: data
});

if(response.data ==="exist"){
    throw new SubmissionError({
      service: "You have already an active appointment for this service!"
    })
  }
  else
  handleSubmit();

}

regardless of what i get from sever, it does not process further when i click submit

Hi @Rory Smith, Could you please help me with my code. i check in the mysql table if a record with that email and service exists, if yes, i return exist if not i return notExist, but i when i receive it via response.data , my condition does not work ad expected