Object reference Error Because of Null value passing in Dataview

Hi,
I am getting Object reference error While Opening a screen.
The Issue Which I found was “Inside the Data View declaration Field Value is going null”;
Ex:
        public PXSelect<Table1,
          Where<Table1.Field1,
          Equal<Current<Table2.Field1>>,
            And<Table1.Field2,
                Equal<Current<Table2.Field2>>>
            >> DataView; 

In the Above Sample Query I am getting Table1.Field2 is Null value..Because of that Object reference issue is throwing while opening screen.

How can I solve this type of issue. Can any one suggest on this??

Thanks,
Giri.