Why can't I determine the style of the row where the “target cell” is located?

I would like to exclude the "target cell" from being an footerRow.

Isn't this "parentRows" a table row?

myTable.columns.item(i).cells.item(j).parentRows.rowType !== RowTypes.FOOTER_ROW

Error: parentRows does not support the rowType property or method.

var cell = app.activeDocument.selection[0].parent;
var myTable = cell.parent;
var myFooterRow = myTable.rows[-1];
for (var i = 0; i < myTable.columns.length; i++) {
    for (var j = 0; j < myTable.columns.item(i).cells.length; j++) {
        if ((myTable.columns.item(i).cells.item(j).contents == "")
            && (myTable.columns.item(i).cells.item(j).parentRows.rowType !== RowTypes.FOOTER_ROW)