Sort Order set to 'None' causes NullPointerException

[ksomnath]

I have an HTML 5 Graph. In the report query, I do SELECT....FROM...ORDER BY MONTH_NUMBER. In the graph, I want to order the display as Jan, Feb, March etc. So my field for Series looks like this: $F{MonthNo}+ "-" + $F{PMonthName} + "-" + $F{YearNo} and it is set to String. So to stop Jaspersoft from sorting it, I set the Sort Order for the field to "None", since I am already sorting this in my query correctly. But when I publish to JasperServer 5.1.0, the report crashes with a NullPointerException. If I set the sort order of the field to ascending, the report works fine, but the display is messed up, as April is the first month to be displayed. Any ideas?