I am passing JSON data to dependent input field

Question

GET http://localhost:8000/getguardrate/1?_token=kSrGyMIF7twomtmIShadxWbqhNpUKlrxH6lEwDO6 500 (Internal Server Error)

this is my ajax call

$(document).ready(function() {
    $('#select2-3').on('change', function() {
        var c_id = $(this).val();
          console.log(c_id);
        if(c_id) {
            $.ajax({
                url: 'getguardrate/' +c_id,
                type: "GET",
                data : {"_token":"{{ csrf_token() }}"},
                dataType: "json",
                success:function(data) {
                    //   console.log(data);
                  if(data){
                    $('#GetsiteguardRate').empty();
                    $('#GetsiteguardRate').focus; 


                    
                    $("#GetsiteguardRate").val(data[0]['sbr_g']);                      
               
              }else{
                $('#GetsiteguardRate').empty();
              }
              }
            });
        }else{
           $('#select2-3').empty();
        }
    });
});