Object reference not set to an instance of an object.S

Using "Export / Export Wizard" so that I can get SQL statement included in results.  Right-clicking in results to initiate export. 

Works fine with statement with no parameter.  But with statement with a parameter, such as "Select part_nbr from parts_db where part_nbr = &myPart" I get the error below when attempting to export the results using the Export Wizard.  Is there any way in Toad Data Point to export the results with the SQL when the SQL contains a variable/parameter???