#div/0 error

[Tracy]

I am trying to perform a calculation on a field where the
divosor may be 0. I want the number 0 to show, not the
divo.

This is my control source. How do I change it
appropriately?

=[real1]/[ttl_invoice]

Thanks in advance

 

[Wayne Morgan]

=IIf([ttl_invoice]=0, 0, [real1]/[ttl_invoice])