diff --git a/js/app/models/PlotObjects/PlotHistogram1DSerieObject.js b/js/app/models/PlotObjects/PlotHistogram1DSerieObject.js
index c6e2100..f23b2dd 100644
--- a/js/app/models/PlotObjects/PlotHistogram1DSerieObject.js
+++ b/js/app/models/PlotObjects/PlotHistogram1DSerieObject.js
@@ -29,14 +29,16 @@ Ext.define('amdaPlotObj.PlotHistogram1DSerieObject', {
     
     constructor: function(){
         var me = this;
-        if (!arguments['histo1d-yaxis']) {
-            // Compatibility mode to support old saved requests
-            arguments['histo1d-yaxis'] = amdaDefaultValues.plot.histogram1D.histo1DyAxis;
-        }
-        if (!arguments['histo1d-style']) {
-            // Compatibility mode to support old saved requests
-            arguments['histo1d-style'] = amdaDefaultValues.plot.histogram1D.histo1DStyle;
-        }
+	if ((arguments.length > 0) && arguments[0]) {
+        	if (!arguments[0]['histo1d-yaxis']) {
+            		// Compatibility mode to support old saved requests
+            		arguments[0]['histo1d-yaxis'] = amdaDefaultValues.plot.histogram1D.histo1DyAxis;
+        	}
+        	if (!arguments['histo1d-style']) {
+            		// Compatibility mode to support old saved requests
+            		arguments[0]['histo1d-style'] = amdaDefaultValues.plot.histogram1D.histo1DStyle;
+        	}
+	}
         me.callParent(arguments);
     },
     
diff --git a/js/app/models/PlotObjects/PlotHistogram2DSerieObject.js b/js/app/models/PlotObjects/PlotHistogram2DSerieObject.js
index 2a5128d..578d416 100644
--- a/js/app/models/PlotObjects/PlotHistogram2DSerieObject.js
+++ b/js/app/models/PlotObjects/PlotHistogram2DSerieObject.js
@@ -30,11 +30,13 @@ Ext.define('amdaPlotObj.PlotHistogram2DSerieObject', {
     
     constructor: function(){
         var me = this;
-        me.callParent(arguments);
-        if (!arguments['histo2d-yaxis']) {
-            // Compatibility mode to support old saved requests
-            arguments['histo2d-yaxis'] = amdaDefaultValues.plot.histogram2D.histo2DyAxis;
-        }
+	if ((arguments.length > 0) && arguments[0]) {
+        	if (!arguments[0]['histo2d-yaxis']) {
+            		// Compatibility mode to support old saved requests
+            		arguments[0]['histo2d-yaxis'] = amdaDefaultValues.plot.histogram2D.histo2DyAxis;
+        	}
+	}
+	me.callParent(arguments);
     },
     
     setDefaultValues: function()
--
libgit2 0.21.2