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Problems with null in an SQL

PBLack asked
Last Modified: 2012-05-12
Hello Experts

I am trying to figure out why my SQL is returning EOF = False and throwing an error when there is no value in the table that has a woodcat = Logs and Diameter >= 24

In other words this query, based on the current table I have, should return EOF = True and I do not know why it does not.

Please help.



The code below throws the following error:

Runtime Error. Invalid use of Null

Dim db as database
Dim strVol as string
Dim recVol as Recordset
Dim logs24 as Double

Set db = CurrentDb()

strVol = "SELECT Sum(VOLHA) AS TOTVOL FROM tblMTally WHERE woodcat = 'Logs' AND ta_dbh >= 24;"
Set recVol = db.OpenRecordset(strVol, dbOpenDynaset)

With recVol
    If .EOF = False Then
        logs24 = Nz(CDbl(!TOTVOL), 0) 'error thrown on this line
    End If
End With
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