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I think there's something missing, I get an error if I try to delete an item (Invalid update: invalid number of rows)

CoreData: error: Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (2), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). with userInfo (null)

Solved it! - I ran into the same problem and realised what I had done wrong...

case.Delete:
      guard let indexPath = indexPath else { return }
      tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
Check your code matches above, I made the mistake of trying to use newIndexPath (instead of indexPath) and putting the incorrect method call to the tableView (3 different methods for insert, delete and reload).
Hope that helps,