>>>>>
>>>>
>>>>It means that date is out of the allowed range: from January 1, 1753 through December 31, 9999.
>>>
>>>I don't think I have dates outside this range. Most likely, either my table is corrupted or the date is empty. I will check all fields.
>>
>>An empty date is outside of the range.
>
>My SQL Server smalldatetime field allows NULLs. Do you know if I set value to ".NULL." it will work (for those records where date is empty)?

Yes, it should.