=== modified file 'dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/grid/Grid.java'
--- dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/grid/Grid.java	2010-04-12 21:23:33 +0000
+++ dhis-2/dhis-support/dhis-support-system/src/main/java/org/hisp/dhis/system/grid/Grid.java	2010-05-12 18:23:51 +0000
@@ -152,7 +152,7 @@
         
         if ( grid.size() != columnValues.size() )
         {
-            throw new IllegalStateException( "Column values are not equal to number of rows" );
+            throw new IllegalStateException( "Number of column values (" + columnValues.size() + ") is not equal to number of rows (" + grid.size() + ")" );
         }
         
         for ( int i = 0; i < grid.size(); i++ )
@@ -198,6 +198,10 @@
             {
                 regressionColumn.add( String.valueOf( getRounded( predicted, 1 ) ) );
             }
+            else
+            {
+                regressionColumn.add( null );
+            }
         }
 
         addColumn( regressionColumn );