I have the following piece of code and want to restart the procedure if the
user inserts nothing OR zero in the first inputbox and then clicks "No" on
the proceeding MsgBox.

Please highlight, what is wrong with the code?

Public Sub CNV()
Dim check12 As Double
check12 = Application.INPUTBOX (prompt:="Input Dollar Conversion Rate",
Type:=1)
If check12 Is Nothing Then
fb = MsgBox("You have not inserted anything. You want to continue?",
vbYesNo)
If fb = vbYes Then
ActiveCell = "=A1*" & check
Else: GoTo check12
End If
End If
End Sub

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Best Regards,
FARAZ A. QURESHI