Test case cannot really be provided as this piece relies on my PHP database to be bundled with to correctly display data.
Uncaught TypeError: Cannot read properties of undefined (reading 'hasOwnProperty')
at Checkboxes.isCellSelectable (dataTables.checkboxes.min.js:5:11397)
at B.<anonymous> (dataTables.checkboxes.min.js:5:13773)
at B.iterator (jquery.dataTables.min.js:120:199)
at B.<anonymous> (dataTables.checkboxes.min.js:5:13583)
at Object.select (jquery.dataTables.min.js:122:330)
at HTMLInputElement.<anonymous> (rooster:487:58)
at HTMLTableElement.dispatch (jquery-3.6.0.min.js:2:43064)
at HTMLTableElement.v.handle (jquery-3.6.0.min.js:2:41048)
isCellSelectable @ dataTables.checkboxes.min.js:5
(anonymous) @ dataTables.checkboxes.min.js:5
iterator @ jquery.dataTables.min.js:120
(anonymous) @ dataTables.checkboxes.min.js:5
(anonymous) @ jquery.dataTables.min.js:122
(anonymous) @ rooster:487
dispatch @ jquery-3.6.0.min.js:2
v.handle @ jquery-3.6.0.min.js:2: This is the error I'm currently getting.
Description of problem: I'm trying to get RowGrouping to work with Checkboxes extension from Gyrocode, which is a datatables plugin/extension however I'm being disturbed by this error and can't really figure it out.

The code:

 var table = $('#rooster').DataTable({
            "processing": true,
            "serverSide": true,
            "ajax": {
                "url": "private",
            },
            select: {
                style: 'multi'
            },
            order: [
                "4", "asc"
            ],
            rowId: 'id',
            mark: true,
            responsive: true,
            dom: 'Bfrtip',
            rowGroup: {
                endRender: function(rows, group) {
                    let split = group.split(", ");
                    return "Totale salaris voor: " + split[0] + ` (${split[1]}) : ` + "€" + rows.data()
                        .pluck("totaal")
                        .sum();
                },
                dataSrc: "maand",
                'startRender': function(rows, group) {
                    // Assign class name to all child rows
                    var groupName = 'group-' + group.replace(/[^A-Za-z0-9]/g, '');
                    var rowNodes = rows.nodes();
                    rowNodes.to$().addClass(groupName);

                    // Get selected checkboxes
                    var checkboxesSelected = $('.dt-checkboxes:checked', rowNodes);

                    // Parent checkbox is selected when all child checkboxes are selected
                    var isSelected = (checkboxesSelected.length == rowNodes.length);

                    return '<label><input type="checkbox" class="group-checkbox" data-group-name="' +
                        groupName + '"' + (isSelected ? ' checked' : '') + '> ' + group + ' (' + rows.count() + ')</label>';
                }
            },
            columns: [{
                    data: null,
                    defaultContent: "",
                    orderable: false
                },
                {
                    data: null,
                    'checkboxes': {
                        'selectRow': true
                    }
                },
                {
                    data: "maand",
                },
                {
                    data: "week"
                },
                {
                    data: "starttijd"
                },
                {
                    data: "eindtijd"
                },
                {
                    data: "Werkgever"
                },
                {
                    data: "werkuren"
                },
                {
                    data: "uurloon"
                },
                {
                    data: "totaal"
                },
                {
                    data: "ziek"
                }
            ],
                select: {
                style: 'multi',
                selector: 'td:nth-child(2)'
            },
            buttons: [{
                    extend: "create",
                    text: "Nieuwe gebruiker",
                    editor: editor
                },
                {
                    extend: "edit",
                    text: "Bewerk gebruiker",
                    editor: editor
                },
                {
                    extend: "remove",
                    text: "Verwijder gebruiker",
                    editor: editor
                },
            ],
            splitEuro: function(row, data, dataIndex) {
                let totaal = document.querySelector('td:eq(9)');
                console.log(row)
            },

            createdRow: function(row, data, dataIndex) {

                $(row).find('td:eq(9)')
                    .attr('data-sort', data.sort ? data.totaal : function() {
                        let split = data.totaal.split("€")
                        return split[1]
                    })
                    .addClass('data-sort')
            },
            "footerCallback": function(row, data, start, end, display) {
                var api = this.api();
                api.columns(9, {
                    page: 'current'
                }).every(function() {
                    var sum = this
                        .nodes()
                        .reduce(function(a, b) {
                            var x = parseFloat(a) || 0;
                            var y = parseFloat($(b).attr('data-sort')) || 0;
                            return x + y;
                        }, 0);
                    $(this.footer()).html("€" + sum.toFixed(2));
                })
            },

        });
        $('#rooster').on('click', '.group-checkbox', function(e) {
            // Get group class name
            var groupName = $(this).data('group-name');

            // Select all child rows
            table.cells('tr.' + groupName, 0).checkboxes.select(this.checked);
        });

        // Handle click event on "Select all" checkbox
        $('#rooster').on('click', 'thead .dt-checkboxes-select-all', function(e) {
            var $selectAll = $('input[type="checkbox"]', this);
            setTimeout(function() {
                // Select group checkbox based on "Select all" checkbox state
                $('.group-checkbox').prop('checked', $selectAll.prop('checked'));
            }, 0);
        });
    });