diff --git a/datumbox-framework-core/src/main/java/com/datumbox/framework/core/common/dataobjects/Dataframe.java b/datumbox-framework-core/src/main/java/com/datumbox/framework/core/common/dataobjects/Dataframe.java
index d7bba61f..48b13865 100644
--- a/datumbox-framework-core/src/main/java/com/datumbox/framework/core/common/dataobjects/Dataframe.java
+++ b/datumbox-framework-core/src/main/java/com/datumbox/framework/core/common/dataobjects/Dataframe.java
@@ -670,7 +670,11 @@ public FlatDataList getXColumn(Object column) {
         FlatDataList flatDataList = new FlatDataList();
 
         for(Record r : values()) {
-            flatDataList.add(r.getX().get(column));
+            Object v = r.getX().get(column);
+            if (v == null)
+                flatDataList.add(new Double(0.0));
+            else
+                flatDataList.add(v);
         }
 
         return flatDataList;