I have a boolean function that checks to see if a Worksheet Name exists tied to a checkbox. While I have coding that stops the checkbox from errors while it is true, if it false, the boolean value gives me an error 13.

```
Function WorksheetExists(sheetName As String) As Boolean
    WorksheetExists = Evaluate("ISREF('" & sheetName & "'!A1)")
End Function

```

What I want to do, is set it so that if there is no value in the sheetName, the function simply ends. Is this possible?