Exception Thown in GetEngine when only 1 value is requested

[sercon]

When you change then number of values requested in the pivot.js to only 1....

    }],
    values: [
    {
        name: 'Price', caption: 'Sold Amount'
    },],

The server-side-pivot-engine-for-pivot-table will throw a System.NullReferenceException on line 47 in the PivotController.cs..

[sercon]

Strangly enough, leaving the two values in place and the removing the value in the pivottable in the browser works as expected.