--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/inundationduration/InundationDurationState.java	Tue Jun 26 16:17:30 2018 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/uinfo/inundationduration/InundationDurationState.java	Tue Jun 26 19:48:35 2018 +0200
@@ -15,6 +15,7 @@
 import org.dive4elements.artifacts.CallContext;
 import org.dive4elements.river.artifacts.ChartArtifact;
 import org.dive4elements.river.artifacts.D4EArtifact;
+import org.dive4elements.river.artifacts.MapArtifact.MapState;
 import org.dive4elements.river.artifacts.common.AbstractCalculationExportableResult;
 import org.dive4elements.river.artifacts.model.Calculation;
 import org.dive4elements.river.artifacts.model.CalculationResult;
@@ -22,13 +23,12 @@
 import org.dive4elements.river.artifacts.model.EmptyFacet;
 import org.dive4elements.river.artifacts.model.FacetTypes;
 import org.dive4elements.river.artifacts.model.ReportFacet;
-import org.dive4elements.river.artifacts.states.DefaultState;
 import org.dive4elements.river.artifacts.uinfo.UINFOArtifact;
 
 /**
  * @author Domenico Nardi Tironi
  */
-public class InundationDurationState extends DefaultState {
+public class InundationDurationState extends MapState {
 
     /// ** The log that is used in this state. */
     // private static Logger log = Logger.getLogger(FlowDepthState.class);
@@ -60,6 +60,10 @@
             facets.add(new EmptyFacet());
             return null;
         }
+
+        if (facets != null)
+            super.computeAdvance(artifact, hash, context, facets, old);
+
         return compute((UINFOArtifact) artifact, context, hash, facets, old);
     }