NullPointer in CollumnFooter

[fother]

change the code for this..

public class AggregationGridExample extends LayoutContainer {

	@Override
	protected void onRender(Element parent, int index) {
		super.onRender(parent, index);

		setLayout(new FlowLayout(15));

		List<ColumnConfig> configs = new ArrayList<ColumnConfig>();

		ColumnConfig column = new ColumnConfig();
		column.setId("name");
		column.setHeader("Company");
		column.setWidth(200);
		column.setToolTip("sfsdf");
		configs.add(column);

		column = new ColumnConfig();
		column.setId("last");
		column.setHeader("Last");
		column.setAlignment(HorizontalAlignment.RIGHT);
		column.setWidth(100);
		configs.add(column);

		column = new ColumnConfig("date", "Last Updated", 100);
		column.setAlignment(HorizontalAlignment.RIGHT);
		column.setDateTimeFormat(DateTimeFormat.getShortDateFormat());
		configs.add(column);

		final ListStore<Stock> store = new ListStore<Stock>();
		store.add(new ArrayList<Stock>());

		ColumnModel cm = new ColumnModel(configs);

		AggregationRowConfig<Stock> totals = new AggregationRowConfig<Stock>();
		totals.setHtml("name", "Average");

		totals.setSummaryType("last", SummaryType.AVG);
		totals.setSummaryFormat("last", NumberFormat.getCurrencyFormat());

		cm.addAggregationRow(totals);

		Grid<Stock> grid = new Grid<Stock>(store, cm);
		grid.setBorders(false);
		grid.setAutoExpandColumn("name");
		grid.setBorders(true);

		add(grid);
	}
}

stacktrace

[ERROR] Uncaught exception escaped
java.lang.NullPointerException: null
	at com.extjs.gxt.ui.client.widget.grid.ColumnFooter.refresh(ColumnFooter.java:221)
	at com.extjs.gxt.ui.client.widget.grid.ColumnFooter.onRender(ColumnFooter.java:173)
	at com.extjs.gxt.ui.client.widget.Component.render(Component.java:892)
	at com.extjs.gxt.ui.client.widget.Component.onAttach(Component.java:1425)

[sven]

That is already fixed in SVN

[fother]