MS Access - prevent a form from being closed

You can set Cancel=1 on the form's unload event to prevent it from unloading.

Private Sub Form_Unload(Cancel As Integer)
If <condition> Then
    Cancel = 1
End If
End Sub

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Thank you.

I've added the code but when I slect the X to close the form I get an error
Complie Errort: syntax Error.

Upon debug the line
If <condition> Then
is highlighted.

any ideas?

Thank you. Sorry for been so dumb.