No Depreciation Deduction

In 2018 I rented my home for 365 days.  This was specified on Schedule E under "Fair Rental Days".  Unfortunately as I was preparing my 2019 tax return (via TurboTax) I discovered that no depreciation expense was entered into my Schedule E for 2018.  How does this happen when I specified on my 2018 return 365 days for the "Fair Rental Days"?