reporting services - Divide by zero SSRS -

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i need in adding logic following code handle divide 0 

=iif(fields!coverage.value = 0, sum(fields!calculatedtotalincidents.value) / (reportitems!calculatedunitssold1.value), sum(fields!calculatedtotalincidents.value) / sum(fields!calculatedunitssold.value))

try this:

=iif(fields!coverage.value = 0, sum(fields!calculatedtotalincidents.value)/    iif((reportitems!calculatedunitssold1.value)<>0,    (reportitems!calculatedunitssold1.value),1), sum(fields!calculatedtotalincidents.value) /     iif(sum(fields!calculatedunitssold.value)<>0, sum(fields!calculatedunitssold.value),1))

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