An INT field has 80,000 null values, 100% null values. The Min and Max report extremely large magnitude numbers (9223372036854776000).
The max & min values of null should be null or zero valued.
Where this causes a problem is a downstream feed monitoring program looking and min/max values with a threshold to fire off an alarm. Returning extreme values (9223372036854776000) would set off too many false alarms.