❔ ❔ MVC - Chart - Model - NullReferenceException

      function drawStuff() {

        var button = document.getElementById('change-chart');
        var chartDiv = document.getElementById('chart_div');

        var data = google.visualization.arrayToDataTable([

        @Html.Raw($"['User Phone', 'Date', 'Time of Day', 'Blood Sugar (mg/dl)'],")
        @foreach (var item in Model)
        {
            @Html.Raw($"['{@item.userPhone}', {@item.measureDate}, {@item.timeOfDay}, {@item.mgBloodSugar}],")
        }
        ]);