Hi Shalabh Sharma, can you reproduce this issue on a new page that only contains the chart and standard salesforce objects and fields? If yes, could you please share the XML? I would like to test it.
Thanks, Luzie

Sorry but what we have is a complete custom implementation and we dont use standard objects so replicating it would be difficult. But what I notice is that when I try to click on the null category the generated query on the model, does not have that null check.

We had a similar issue with charts listing clients and a small number of responses at regular meetings. Frequently the Response value was “None” (i.e. null) and there was no information generated for that slice of the “pie.” We restructured the object and interface so that a “Not Answered” value could be defaulted into the field and clean up the chart. (This was in Brooklyn, by the way.)
One suspects a test case might be built using the User object, Luzie, as we also would need to do in our fully custom environment.

So, you are suggesting to replace all “null” values with an actual “Null” picklist value?