diff --git a/src/main/java/org/gcube/portlets/user/td/jsonexportwidget/client/JSONWorkSpaceSelectionCard.java b/src/main/java/org/gcube/portlets/user/td/jsonexportwidget/client/JSONWorkSpaceSelectionCard.java
index c1b656a..2694140 100644
--- a/src/main/java/org/gcube/portlets/user/td/jsonexportwidget/client/JSONWorkSpaceSelectionCard.java
+++ b/src/main/java/org/gcube/portlets/user/td/jsonexportwidget/client/JSONWorkSpaceSelectionCard.java
@@ -88,7 +88,8 @@ public class JSONWorkSpaceSelectionCard extends WizardCard {
 
 		wpanel = new WorkspaceExplorerSelectPanel(new String(
 				"Workspace Selection"), selectableTypes, showableTypes);
-
+		//wpanel.getElement().setAttribute("background-color", "white");
+		
 		WorskpaceExplorerSelectNotificationListener handler = new WorskpaceExplorerSelectNotificationListener() {
 
 			@Override
@@ -114,14 +115,21 @@ public class JSONWorkSpaceSelectionCard extends WizardCard {
 				Log.debug("WorkspaceExplorer Aborted");
 
 			}
+
+			@Override
+			public void onNotValidSelection() {
+				thisCard.exportSession.setItemId(null);
+				
+			}
 		};
 
 		wpanel.addWorkspaceExplorerSelectNotificationListener(handler);
-
+		
+		
 		// /
 		p.add(new FieldLabel(wpanel, "Folder"), new VerticalLayoutData(1, 1));
-
 		setContent(formPanel);
+		
 
 	}