If statement into sum and set analysis

[noemibuscemi01]

How can I add the if statement into the following sum?

=sum({<
[BadRate.Quarter] = {$(=$(vQuarterLLP))}
>}
[BadRate.Mature_BR3_F3])

if statement:
if [BadRate.Mature_BR3_F3] = 0, null(), [BadRate.Mature_BR3_F3]

Thanks!

[Anil_Babu_Samineni]

Perhaps this

=sum({<[BadRate.Quarter] = {$(=$(vQuarterLLP))}>} If([BadRate.Mature_BR3_F3] = 0, null(), [BadRate.Mature_BR3_F3]))