Empty password and confirm password error- Uncaught TypeError: Cannot read property 'join'

[coloftech]

When i try to send the form without typeing the password in a signup form this what i get in my console: Uncaught TypeError: Cannot read property 'join' (line 171);

Im not yet good in jquery but this is how i temporary solve this bug.

    obj.find(settings.passwordField).each(function (i) {
      if($(this).val().length > 0){

        $(this).val(realPasswordMapper[this.id].join(''));
      }
        
    });  

Hoping you can help me the best way to solved this issue thanks.