Using server side processing, data cannot load

Hi everyone,
i have 25.000 row data and i use datatable using server side data processing
until there are 14.000 row data the datatable working without error
but when the data more than 14.000 row, it can't load the page, i use google chrome and the error message was:
"No data received
Reload Hide details
Unable to load the webpage because the server sent no data.
Error code: ERR_EMPTY_RESPONSE"

please anyone can help me

bellow was my code:

<script>
jQuery(document).ready(function($) {
         $('.table-mail').dataTable( {
           "processing": true,
            "serverSide": true,
            "dom" : '<"col-sm-12"f><"clearfix divid"><"box-opsi"<""r><"top col-sm-6"><"col-sm-6"p>>t<"bottom">li',
             "ajax": {
                    "url": "{{URL::to('data/warga')}}",
                    "type": "POST",
                    "data": function ( d ) {
              }
            },
            "order": [[2, 'asc' ]],
             "createdRow": function ( row, data, index ) {
            },
            drawCallback: function(){
                 $('[data-toggle="tooltip"]').tooltip();
            }
        } );
    });
</script>

Thanks