"Invalid Use of Null" Error when using combobox

i use values from a combobox to pass to a query that filters a table but i get the
"Invalid Use of Null" Error when i type in a value in the combobox not part of the drop down list. I expect this value to be passed to my procedure as well and no records will be returned. What i am i doing wrong?
peterslove53Asked:
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Gustav BrockCIOCommented:
Don't type an unknown value. Double-click the content and delete it.

/gustav

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peterslove53Author Commented:
how do i change that to a more user friendly error message
Gustav BrockCIOCommented:
One option is, in you code that uses the value from the combobox, to have a check for Null:

If IsNull(Me!YourCombobox.Value) Then
    ' Wrong or no entry.
    MsgBox "Select an option."
Else
    ' Continue.
    ' Run your present code.
End If

/gustav
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