I'm trying to implement a simple search algorithm via vba.

My Problem is that i cannot seem to handle a #value error within vba

The UDF is called "FindBP"

Sometimes the Variable vIndex causes an #N/A Error, resulting in an
#vlaue error of the function.
I want to replace the vIndex calculation, every time it gives an
error.

My Implementation doesn't seem to work:

......
vIndex = WorksheetFunction.Match(vBP, rg, -1)
vCount = WorksheetFunction.Index(rg, vIndex)

If IsError(vCount) Then
vIndex = WorksheetFunction.Match(vBP, rg, 1)
FindBP = WorksheetFunction.Index(rg, vIndex)
Else
FindBP = WorksheetFunction.Index(rg, vIndex)
End If
.....

Any help is highly appreciated.

Thy in advance