SQL CLR Table-Valued Function System.NullReferenceException

Question

Good day.
I wrote a clr table-valued function that gets the data from the sharepoint list using the client model.
Sometimes I get exception (When I calling this function I get 90000 rows and then I get this exception...):
Msg 6260, Level 16, State 1, Line 1
An error occurred while getting new row from user defined Table Valued Function :
System.NullReferenceException: Object reference not set to an instance of an object. System.NullReferenceException: v at SDS.FillRow(Object obj, SqlInt32& month, SqlString& datePlanSalary, SqlString& dilerCode, SqlString& dilerName, SqlString&
model, SqlInt32& countSalary).
How can I fix this issue?
My Code:
public class SDS
[SqlFunction(SystemDataAccess = SystemDataAccessKind.Read, FillRowMethodName = "FillRow")]
public static IEnumerable SDSItems(SqlString url, SqlString listName)
ClientContext context = new ClientContext(url.ToString());
List list = context.Web.Lists.GetByTitle(listName.ToString());
CamlQuery query = new CamlQuery();
query.ViewXml = "<View/>";
ListItemCollection listItems = list.GetItems(query);
context.Load(list);
context.Load(listItems);
context.ExecuteQuery();
return listItems;
public static void FillRow(
object obj,
out SqlInt32 month,
out SqlString datePlanSalary,
out SqlString dilerCode,
out SqlString dilerName,
out SqlString model,
out SqlInt32 countSalary
item = (ListItem)obj;
month = Convert.ToInt32(item["_x041c__x0435__x0441__x044f__x04"]);
datePlanSalary = Convert.ToString(item["_x0414__x0430__x0442__x0430__x000"]);
dilerCode = Convert.ToString(item["_x041a__x043e__x0434__x0020__x04"]);
dilerName = Convert.ToString(item["_x041d__x0430__x0437__x0432__x04"]);
model = ((FieldLookupValue)item["_x041c__x043e__x0434__x0435__x04"]).LookupValue;
countSalary = Convert.ToInt32(item["_x041a__x043e__x043b__x0438__x04"]);

Answer 1

That's not a lot of information to go on, but...
Can you put a check in your FillRow method for a null object (or one of your fields being null) and put out diagnostic information? Or is it happening in the ListItemCollection iterator itself? (i.e. before it returns a row back to FillRow). If it's happening
in the iterator, perhaps you could subclass it and return diagnostics at that point.
I'm also wondering (if it actually always happen at row 90000) if you're hitting a limit in web service call, or iterator, or UDF code. Does the function ever return more than 90000 rows successfully?
Hope this helps, Bob