Error in Jquery targeting

Question

I am using the following code so that after the login and password it is directed to the respective page. Locally it works, but when I go up to the server, it’s giving Chrome error:

ERR_TOO_MANY_REDIRECTS

And in Firefox:

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As I said earlier, locally it works perfectly. The code I’m using for redirect is:

<script type="text/javascript">
$(document).ready(function(){
   $('#login-form').submit(function() {
     data = $('#login-form').serialize();
     $.post("validar.php",{
            d: data,
     },
      function (d) {
        console.log(d);
       if(d == 1){
           $('#myModal').modal('show');
        }else{
         var redirecionar = "sistema/";
        $(window.document.location).attr('href',redirecionar);
        }
      });
      return false;
    });
});
</script>

It is worth remembering that the directory system/ exists.