diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
index 537f37c..63ca55f 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/AsyncTreePanel.java
@@ -46,6 +46,7 @@ import com.extjs.gxt.ui.client.widget.button.Button;
 import com.extjs.gxt.ui.client.widget.layout.FitLayout;
 import com.extjs.gxt.ui.client.widget.treepanel.TreePanel;
 import com.extjs.gxt.ui.client.widget.treepanel.TreePanel.TreeNode;
+import com.google.gwt.core.client.GWT;
 import com.google.gwt.event.shared.HandlerManager;
 import com.google.gwt.user.client.Event;
 import com.google.gwt.user.client.rpc.AsyncCallback;
@@ -740,6 +741,7 @@ public class AsyncTreePanel extends LayoutContainer {
 			public void onFailure(Throwable caught) {
 				
 				if(caught instanceof SessionExpiredException){
+					GWT.log("Session expired");
 					eventBus.fireEvent(new SessionExpiredEvent());
 					return;
 				}
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
index b10b385..adc134a 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
@@ -312,7 +312,7 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 	}
 	
 	@Override
-	public List<FileGridModel> getFolderChildrenForFileGridById(String folderId) throws Exception {
+	public List<FileGridModel> getFolderChildrenForFileGridById(String folderId) throws Exception, SessionExpiredException {
 		
 		Workspace workspace;