Attempt to open 'Find Model Object' dialog results in NPE

Attempt to open the 'Find Model Object' dialog via 'Search > Teiid Designer > Find Model Object' results in this NPE:

java.lang.NullPointerException
at org.teiid.designer.ui.search.ModelObjectSelectionDialog.updateOkState(ModelObjectSelectionDialog.java:514)
at org.teiid.designer.ui.search.ModelObjectSelectionDialog.handleUpperSelectionChanged(ModelObjectSelectionDialog.java:416)
at org.teiid.designer.ui.search.ModelObjectSelectionDialog.handleSelectionChanged(ModelObjectSelectionDialog.java:400)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.handleWidgetSelected(AbstractElementListSelectionDialog.java:388)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog.access$0(AbstractElementListSelectionDialog.java:383)
at org.eclipse.ui.dialogs.AbstractElementListSelectionDialog$1.widgetSelected(AbstractElementListSelectionDialog.java:373)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)