Adding Rows to Table

I can't seem to add rows to an existing table. For example, I have an existing workbook named 'test.xlsx', an existing sheet named 'Sheet 1' and an existing Table in that sheet named 'JDB'. The library seems to read everything fine but when I try the addRow method on the Table I get an error: "return this.table.rows.length -- TypeError: Cannot read property 'length' of undefined"

Sample code that is causing error:

```
const addRows = async () => {
const workbook = new ExcelJS.Workbook();
await workbook.xlsx.readFile('test.xlsx');
const sheet = workbook.getWorksheet('Sheet 1');
const table = sheet.getTable('JDB');

table.addRow([8,9,0,'End']);
table.commit();

await workbook.xlsx.writeFile('test.xlsx');
}
```