[UITableView _contentOffsetForScrollingToRowAtIndexPath:atScrollPosition:]

Seems to me that your table view does not have any rows or sections in yet. Two possibilities come to my mind.

1. Check your numberOfRowsInSection delegate and numberOfSectionsInTableView so that they are not set to 0.
2. Its possible that the tableview has not yet finished loading the data.

Do share your findings, so I might be able to help out further if needed.