How do I handle the following errors?

Hi Koolreport Team~

A PHP Error was encountered Severity: Notice

Message: Undefined index: childOrder

Filename: widgets/PivotTable.tpl.php

Line Number: 136

Backtrace:

File: ~~/libraries/koolreport/packages/pivot/widgets/PivotTable.tpl.php Line: 136 Function: _error_handler

File: ~~/libraries/koolreport/src/core/Widget.php Line: 706 Function: include

File: ~~/libraries/koolreport/packages/pivot/widgets/PivotTable.php Line: 206 Function: template

File: ~~/libraries/koolreport/src/core/Widget.php Line: 643 Function: onRender

File: ~~/libraries/koolreport/src/core/Widget.php Line: 738 Function: render

File: ~~/modules/stats/reports/buy/Rbuypivot_c.view.php Line: 116 Function: create

File: ~~/libraries/koolreport/src/KoolReport.php Line: 291 Function: include

File: ~~/modules/template/views/layout.php Line: 332 Function: render

File: ~~/third_party/MX/Loader.php Line: 357 Function: include

File: ~~/third_party/MX/Loader.php Line: 300 Function: _ci_load

File: ~~/modules/template/controllers/Template.php Line: 18 Function: view

File: ~~/third_party/MX/Modules.php Line: 71 Function: index

File: ~~/libraries/Layout.php Line: 23 Function: run

File: ~~/modules/stats/controllers/Buypivot.php Line: 145 Function: view

File: ~~/core/App_Controller.php Line: 189 Function: buypivot_c

File: ~/www/food/index.php Line: 317 Function: require_once

rowspan=1 colspan=1 data-layer=1 > Total

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