To reproduce this bug, you need 2 shapefile datasets. Open the attribute table of each dataset. Click the statistics icon for one of them and then click on a field to get the statistics of. Now, click on the other datasets table and then click the statistics button again. I get a null pointer exception that refers me to the log. Here is my stack-trace:

!ENTRY org.eclipse.jface 4 2 2008-09-04 08:36:44.927
!MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.jface".
!STACK 0
java.lang.NullPointerException
at ncsa.gis.ui.tableview.views.DatasetStatsView$MyStatFieldListener.selectionChanged(DatasetStatsView.java:410)
at org.eclipse.jface.viewers.Viewer$2.run(Viewer.java:162)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:880)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.Viewer.fireSelectionChanged(Viewer.java:160)
at org.eclipse.jface.viewers.StructuredViewer.updateSelection(StructuredViewer.java:2062)
at org.eclipse.jface.viewers.StructuredViewer.handleInvalidSelection(StructuredViewer.java:1102)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1378)
at org.eclipse.jface.viewers.StructuredViewer.preservingSelection(StructuredViewer.java:1328)
at org.eclipse.jface.viewers.AbstractTableViewer.inputChanged(AbstractTableViewer.java:574)
at org.eclipse.jface.viewers.ContentViewer.setInput(ContentViewer.java:251)
at org.eclipse.jface.viewers.StructuredViewer.setInput(StructuredViewer.java:1603)
at ncsa.gis.ui.tableview.views.DatasetStatsView.updateFieldList(DatasetStatsView.java:111)
at ncsa.gis.ui.tableview.views.DatasetStatsView.setModel(DatasetStatsView.java:105)
at ncsa.gis.ui.tableview.actions.TableStatistics.run(TableStatistics.java:51)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:251)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)
at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1158)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3401)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3033)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at ncsa.maeviz.rcp.Application.run(Application.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)