null pointer exception on list.add
<p>I've been working on this one error for a few hours so I thought I'd pick the brains of some pros. </p>

<p>I am getting a null pointer exception at the modelData.add(i, es) method. I know from debugging that es isn't null. I'm really confused, thanks.</p>

<pre><code>public class EventTableModel extends AbstractTableModel {

    //private int rowCount = 0;
    protected List&lt;EventSeat&gt; modelData;
    private static final int COLUMN_COUNT = 3;
    private Event e;
    Event j = GUIpos.m;
    int i = 1;

public EventTableModel(Event e) {
    this.e = e;
    try {
        System.out.println(modelData);
        for (EventSeat es : e.getEventSeats()) {
            modelData.add(i, es);
            i++;
        }
    } catch (DataException ex) {
        Logger.getLogger(EventTableModel.class.getName()).log(Level.SEVERE, null, ex);
    }

}
</code></pre>
