diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/action/ActionListPanel.java b/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/action/ActionListPanel.java
index 0c2be89..39ef992 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/action/ActionListPanel.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/action/ActionListPanel.java
@@ -38,7 +38,8 @@ public class ActionListPanel extends Composite {
 	private List<ActionDefinitionDV> listActionDefinition;
 	private HandlerManager appManagerBus;
 
-	public ActionListPanel(HandlerManager appManagerBus,String projectName, String profileID, List<ActionDefinitionDV> listActionDef) {
+	public ActionListPanel(HandlerManager appManagerBus, String projectName, String profileID,
+			List<ActionDefinitionDV> listActionDef) {
 		initWidget(uiBinder.createAndBindUi(this));
 		GWT.log("Adding list of actions: " + listActionDef);
 		this.appManagerBus = appManagerBus;
@@ -60,7 +61,7 @@ public class ActionListPanel extends Composite {
 	private void initActions(List<ActionDefinitionDV> listActionDef) {
 
 		if (listActionDef.size() > 0) {
-			//actionListBasePanel.setVisible(true);
+			// actionListBasePanel.setVisible(true);
 
 			ButtonGroup buttonGroup = new ButtonGroup();
 			buttonGroup.getElement().addClassName("actions-button-group");
@@ -68,12 +69,13 @@ public class ActionListPanel extends Composite {
 			mapPhaseListButtons = new LinkedHashMap<String, List<ActionDefButton>>();
 
 			for (ActionDefinitionDV actionDefinitionDV : listActionDef) {
-				
-				//skipping the special workflow action
-				if(actionDefinitionDV.getId().equals(ConstantsGeoPortalDataEntryApp.WORKFLOW_ACTION_POST_CREATION_ACTION_ID)) {
+
+				// skipping the special workflow action
+				if (actionDefinitionDV.getId()
+						.equals(ConstantsGeoPortalDataEntryApp.WORKFLOW_ACTION_POST_CREATION_ACTION_ID)) {
 					continue;
 				}
-				
+
 				Button butt = new Button();
 				butt.setText(actionDefinitionDV.getTitle());
 				butt.setTitle(actionDefinitionDV.getDescription());
@@ -83,7 +85,8 @@ public class ActionListPanel extends Composite {
 					@Override
 					public void onClick(ClickEvent event) {
 
-						appManagerBus.fireEvent(new WorkflowActionOnSelectedItemEvent<ResultDocumentDV>(actionDefinitionDV));
+						appManagerBus
+								.fireEvent(new WorkflowActionOnSelectedItemEvent<ResultDocumentDV>(actionDefinitionDV));
 
 					}
 				});
@@ -110,9 +113,9 @@ public class ActionListPanel extends Composite {
 
 	public <T> void showActionsOnSelected(List<T> listSelected, GcubeUserRole userRole) {
 		setAllActionsVisible(false);
-	
+
 		if (listSelected.size() == 1) {
-			
+
 			for (T item : listSelected) {
 
 				if (item instanceof ResultDocumentDV) {
@@ -120,20 +123,25 @@ public class ActionListPanel extends Composite {
 					String itemPhase = ((ResultDocumentDV) item).getLifecycleInfo().getPhase();
 
 					List<ActionDefButton> listButtons = mapPhaseListButtons.get(itemPhase);
-					for (ActionDefButton actionDefButton : listButtons) {
-						
-						Set<String> roles = actionDefButton.getActionDefinitionDV().getRoles();
-						
-						 //No role/s defined means enable the action by default
-						if(roles.isEmpty()) {
-							actionDefButton.getButton().setVisible(true);
-							actionListBasePanel.setVisible(true);
-						}else {
-							//Checking if the userRole is matching the role defined in the ActionDefinition
-							boolean isRoleIntoActionDef= roles.stream().anyMatch(userRole.getName()::equalsIgnoreCase);
-							if(isRoleIntoActionDef) {
+
+					if (listButtons != null) {
+
+						for (ActionDefButton actionDefButton : listButtons) {
+
+							Set<String> roles = actionDefButton.getActionDefinitionDV().getRoles();
+
+							// No role/s defined means enable the action by default
+							if (roles.isEmpty()) {
 								actionDefButton.getButton().setVisible(true);
 								actionListBasePanel.setVisible(true);
+							} else {
+								// Checking if the userRole is matching the role defined in the ActionDefinition
+								boolean isRoleIntoActionDef = roles.stream()
+										.anyMatch(userRole.getName()::equalsIgnoreCase);
+								if (isRoleIntoActionDef) {
+									actionDefButton.getButton().setVisible(true);
+									actionListBasePanel.setVisible(true);
+								}
 							}
 						}
 					}
@@ -144,13 +152,19 @@ public class ActionListPanel extends Composite {
 	}
 
 	private void setAllActionsVisible(boolean bool) {
-		Iterator<List<ActionDefButton>> collIterator = mapPhaseListButtons.values().iterator();
-		while (collIterator.hasNext()) {
-			List<ActionDefButton> listButton = collIterator.next();
-			for (ActionDefButton actionDefButton : listButton) {
-				actionDefButton.getButton().setVisible(bool);
-			}
 
+		if (mapPhaseListButtons != null && mapPhaseListButtons.values().size() > 0) {
+
+			Iterator<List<ActionDefButton>> collIterator = mapPhaseListButtons.values().iterator();
+			if (collIterator != null) {
+				while (collIterator.hasNext()) {
+					List<ActionDefButton> listButton = collIterator.next();
+					for (ActionDefButton actionDefButton : listButton) {
+						actionDefButton.getButton().setVisible(bool);
+					}
+
+				}
+			}
 		}
 	}
 }
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/table/ItemsTable.java b/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/table/ItemsTable.java
index 8cca170..0317876 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/table/ItemsTable.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataentry/client/ui/table/ItemsTable.java
@@ -143,6 +143,9 @@ public class ItemsTable<T extends DocumentDV> extends AbstractItemsCellTable<T>
 						String key = itemField.getJsonFields().get(0)
 								.replace(ConstantsGeoPortalDataEntryApp.DEFAULT_DOCUMENT_PROJECTION_NAME + ".", "");
 						Object value = documentDV.getDocumentAsMap().get(key);
+						if(value==null)
+							return "";
+						
 						return value.toString();
 					} catch (Exception e) {
 						GWT.log("Error e: " + e);
@@ -164,6 +167,9 @@ public class ItemsTable<T extends DocumentDV> extends AbstractItemsCellTable<T>
 								.replace(ConstantsGeoPortalDataEntryApp.DEFAULT_DOCUMENT_PROJECTION_NAME + ".", "");
 						Object value = documentDV.getDocumentAsMap().get(key);
 						// GWT.log("key: "+key+" is instance of: "+value.getClass());
+						
+						if(value==null)
+							return;
 
 						if (value instanceof ArrayList) {
 							ArrayList<Object> arrayValues = (ArrayList<Object>) value;