@@ -254,6 +254,7 @@ public class GeneralPartWidget extends CompositeGwtWidgetElement {

 	private void listboxSetValues(ListBox listbox, String value) {

 		if (value == null) {

 			listbox.setSelectedIndex(-1);

+			return;

 		}

 		HashSet<String> set = new HashSet<>(Arrays.asList(value.split(",")));