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ComboBox field is null (how to check?)

ComboBox field is null (how to check?)
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I've a comboBox call Me.cobProbNo, At the cobProbNo On_Change() event I want to exit sub when the combo box is empty.

so I've got this:

If Me.cobProbNo = "" Then
MsgBox "no problem exist"
Exit Sub
End If

Somehow, it does NOT get into the MsgBox statement. How do I 'capture' the fact that combobox may be null?
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So I have created this combobox that requires the user to enter a password when selecting a value in my unbound combobox. If the password is incorrect then the combobox is cleared and is reset to the value it was before the update was attemped.

Now I found code on getting this to work and it works great except for one minor flaw that I am trying to add to it. If the user goes to clear the combobox thus making the value null the Msgbox appears asking for the users password but fails each time because the null username does not exist.

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if I use another table for a string value for the same recordset, the code works and the combobox gets populated with the unique names of the field selected.

I tried to retrieve the values for different fields from the table tblPlants, but I get the same error.
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Goal of my Database: Recording bank transaction (money transfers from one account to another)

Details: On the form on which I record these transaction I have two combo-boxes: 1)Account Debited and 2)Account Credited.
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[CODE]

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