Formula in a textbox

[cfobare79]

The formula below works fine when there is data for both Textboxs. The problem is when the second Textbox is null. Text150 is a sum in the Main Report, Totals1 is a sum in a subreport.

=[Text150]+(IIf(IsNull([VerizonReport].[Report]![Totals1]),0,[VerizonReport].[Report]![Totals1]))

[pbaldy]

If it's a subreport:

nnz function