While loop error in SSIS

Hi there,

I have a problem with SSIS.

with script task I am loading a csv into a table, do a clean up, get data back into a buffer and do a data check (using Visual Basic in Script task).

After the check I update the DB table row by row.

At the end  I do a CSV export with the new data.

This stuf is dynamic, because I have various CSV with different structures.

Now my problem is, I have one CSV that has 4000 rows.

When I do the data check in the script task ( it is a select from with 7 joins) and while loop after that to write the results into variables), the whila loop breaks down after about 1600 rows (sometimes it is 10 rows more or less).

I I split the CSV so that I have less than 1600 rows per CSV, it works fine.

When it breaks down I get the error: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt. (object is not linked to an object instance)

Does anyone know why this happens?

Thanks E.