How to handle database null values in jquery datatable

Add defaultContent in the options while initializing the data table. For more details

columns.defaultContent

Example from the official documentation:

$('#example').dataTable( {
  "columns": [
    null,
    null,
    null,
    {
      "data": "first_name", // can be null or undefined
      "defaultContent": "<i>Not set</i>"
    }
  ]
} );

You can use mRender to specify the display in the event of a null value:

{ 
    "mData": "FeeCompany" 
    'mRender': function (data, type, full) {
        if (full[7] !== null) {
             return full[7]; 
         }else{
             return '';
         }
},