[VB.net] find

Men se bo zmešal...
A kdo ve zakaj mi tole ne dela?

MsgBox(OriginalImage(0).Displaymember)
Dim imgcontainer As ObjectList = OriginalImage.Find(Function(x)
      MsgBox("a: " & x.Displaymember & " " & "PictureBox_Person")
      If x.Displaymember = "PictureBox_Person" Then Return True
      Return False
End Function)
MsgBox(imgcontainer.Displaymember)

V glavnem x.Displaymember je enako "PictureBox_Person"
error je pa (zadnja linija):
System.NullReferenceException: 'Object reference not set to an instance of an object.'
imgcontainer was Nothing.

a nebi moglo biti pri tistem if primerjanje z "==" ?