diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionController.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionController.java
index bfe3d3905..9cb66a516 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionController.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/allocation/streches/StretchesFunctionController.java
@@ -295,4 +295,8 @@ public class StretchesFunctionController extends GenericForwardComposer {
         return graphicGenerator.areChartsEnabled(stretchesFunctionModel);
     }
 
+    public boolean isChartsDisabled() {
+        return !isChartsEnabled();
+    }
+
 }
diff --git a/navalplanner-webapp/src/main/webapp/planner/stretches_function.zul b/navalplanner-webapp/src/main/webapp/planner/stretches_function.zul
index fd8f0876a..8197fd304 100644
--- a/navalplanner-webapp/src/main/webapp/planner/stretches_function.zul
+++ b/navalplanner-webapp/src/main/webapp/planner/stretches_function.zul
@@ -20,7 +20,7 @@
 
 <?page title="${i18n:_('Navalpro: Scheduling')}"?>
 <?taglib uri="/WEB-INF/tld/i18n.tld" prefix="i18n"?>
-<zk>
+<zk xmlns:n="http://www.zkoss.org/2005/zk/native">
 
 <zscript><![CDATA[
     stretchesFunctionController = arg.get("stretchesFunctionController");
@@ -58,12 +58,15 @@
 
     </vbox>
 
-    <vbox id="charts" visible="@{stretchesFunctionController.chartsEnabled}">
+    <vbox id="charts">
+        <div visible="@{stretchesFunctionController.chartsDisabled}">
+            <n:h4>${i18n:_('Can\'t calculate charts for current data')}</n:h4>
+        </div>
         <chart id="dedicationChart" title="${i18n:_('Dedication chart')}"
             type="time_series" threeD="false"
             model="@{stretchesFunctionController.getDedicationChartData}"
             yAxis= "${i18n:_('Hours')}" paneColor="#FFFFFF"
-            showLegend="false" />
+            showLegend="false"/>
 
         <chart id="accumulatedHoursChart"
             title="${i18n:_('Accumulated hours chart')}"