diff --git a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/ChartFiller.java b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/ChartFiller.java
index 307f19f21..1765b6ec6 100644
--- a/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/ChartFiller.java
+++ b/navalplanner-webapp/src/main/java/org/navalplanner/web/planner/chart/ChartFiller.java
@@ -586,7 +586,7 @@ public abstract class ChartFiller implements IChartFiller {
      *the application webpath
      * */
     private String adaptCallbackForTimePlot(String uri){
-        return uri.substring(1);
+        return ! uri.equals("") ? uri.substring(1) : uri;
     }
     @Override
     public void appendPlotinfo(Timeplot chart, Plotinfo plotinfo,