Data provider or other service returned an E_Fail status

My app works with MS Access 2000 using ADO.
I open recordset that contains 93 records.
I move using rs.MoveNext thru the recordset but when I stay on the 79th record and perform rs.MoveNext I get the following error:
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Run-time error '-2147467259(80004005)'

Data provider or other service returned an E_Fail status
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Remark: from 79 to 93 record in my recordset one of the fields contains 'NULL', but I dont read the field, I only move to the next record (MoveNext)...