Null option for Select Field

->options([
    null => 'Standard',
    14 => 'Every 2 Weeks',
    30 => 'Every 30 Days',
    60 => 'Every 60 Days',
    90 => 'Every 90 Days',
    'Never' => 'Never',
])

Works fine for saving, but Standard is not preselected on Edit if the value equals null. Suggestions for solving this?
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