Sales growth % in SSRS report

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SSRS

I am trying to calculate sales growth percentage for 2 financial years(product wise)
But for some of the products its showing null value.

eg.
fy_1617 / fy_1516 / sales growth
0 / 0 / 100
1514561 / 0 / #error
0 / 2156465 / 100

If the fy_1516 value is '0' then the sales growth is showing as 'error' and if both the values are '0' it is showing as 100.

What I have tried:

Code :-

Public Function Divider (ByVal Dividend , ByVal Divisor )

If IsNothing(Divisor ) Or Divisor = 0 Then
Return 0

Else
Return Dividend/Divisor
End If
End Function

Expression :-

IIF (Fields!INVSUM.Value>=0,((Code.Divider(Fields!INVSUM.Value,Fields!INVPrevYear.Value)-1)*100),(((Fields!INVSUM.Value-Fields!INVPrevYear.Value)/Fields!INVPrevYear.Value)*100))