Add blank row solution xls issue after update

So I am working on a multi vendor site and one of our devs reached out a few months back for a solution to add a blank row after each new vendor for a product summary report for an xls file. The solution worked fine until the plugin was updated from V3.1.6 to V3.2.1 and for whatever reason the xls file now produces a empty file except for the column headers.

This was the solution offered by support which didn’t initially work.

add_action('woe_summary_before_output' , function() {
  $current_seller = false;
  $new_rows = array();
  foreach($_SESSION['woe_summary_products'] as $data) {
    if($current_seller AND $current_seller!=$data['Sold By']){
      $new_rows[]=array();
      $current_seller=$data['Sold By'];
    }
    $new_rows[]=$data;
  }
  $_SESSION['woe_summary_products'] = $new_rows;
});

and here is the refactored version that did work.

add_action('woe_summary_before_output' , function() {
     $current_seller = false;
  foreach($_SESSION['woe_summary_products'] as $data) {
    if ($current_seller != $data['Sold By']){
      $new_rows[]=array();
      $current_seller=$data['Sold By'];
    }
    $new_rows[]=$data;
  }
  $_SESSION['woe_summary_products'] = $new_rows;
});

Any suggestions or potential solutions to add a blank row in the xls file with the current plugin version will be very helpful.