Form Field Always Null Even When Showing Data

The code below always displays opens form even when field being tested is null. Any ideas on how to fix that?



Private Sub Assign_Classes_Click()
On Error GoTo Err_Assign_Classes_Click

Dim stDocName As String
Dim msgboxstring As String
Dim stLinkCriteria As String
Me.name_found.Requery


If Not IsNull(Me.name_found) Then

DoCmd.SetWarnings False
DoCmd.OpenQuery "Qry_Load_Client_Classes"
DoCmd.SetWarnings True

stDocName = "Frm_Class_Selection"
DoCmd.OpenForm stDocName, , , stLinkCriteria
Else
msgboxstring = "Client Not Found"
MsgBox (msgboxstring)
End If


Exit_Assign_Classes_Click:
Exit Sub

Err_Assign_Classes_Click:
MsgBox Err.Description
Resume Exit_Assign_Classes_Click

End Sub

Form Field Always Null Even When Showing Data