Coredata结束了崩溃+ viewForHeaderInSection问题

Question

我遇到了非常不寻常的问题。我用fetchviewcontroller实现了coredata。当我删除最后一节的特定行时，我收到了错误。

CoreData：错误：严重的应用程序错误。在调用-controllerDidChangeContent：期间，从NSFetchedResultsController的委托中捕获到异常。 *** - [__ NSArrayM insertObject：atIndex：]：对象不能为userInfo为空（null）

然后我的桌子完全被打扰了，所有排都弄乱了......请看截图。 经过长时间的调试，我发现魔法发生在 viewForHeaderInSection 中。如果我将文本分配给标签然后出现此问题，如果我不这样做它并且永远不会有任何问题。请参考以下代码。

 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
    {

        NSString *programId = [[[_fetchedResultsController sections] objectAtIndex:section] name];

        ImageQueue *info = [_fetchedResultsController objectAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:section]];


        UIView  *baseView = [[UIView alloc] init];
        baseView.backgroundColor = [UIColor appOrangeColor];

        UILabel *lblProgramTitle = [[UILabel alloc] init];
        lblProgramTitle.frame = CGRectMake(0, 0, 0, 0);
        lblProgramTitle.numberOfLines = 0;
        lblProgramTitle.lineBreakMode = NSLineBreakByWordWrapping;
        lblProgramTitle.backgroundColor = [UIColor clearColor];
        lblProgramTitle.textColor = [UIColor blackColor];
        lblProgramTitle.font = [UIFont fontWithName:FONT_OPENSAN_SEMIBOLD size:16];
//This line when commented work otherwise issue occure.
        lblProgramTitle.text = [NSString stringWithFormat:@"%@\n( %@ )",info.eventName,info.programName];
        lblProgramTitle.tag = 100;
        [baseView addSubview:lblProgramTitle];

        NSLog(@"%@\n( %@ )",info.eventName,info.programName);

        [lblProgramTitle enableAutolayout];
        [lblProgramTitle leadingMargin:5];
        [lblProgramTitle trailingMargin:100];
        [lblProgramTitle topMargin:15];
        [lblProgramTitle bottomMargin:15];


        UIButton *btnUploadAll = [UIButton buttonWithType:UIButtonTypeSystem];
        btnUploadAll.backgroundColor = [UIColor clearColor];
        btnUploadAll.frame = CGRectMake(0, 0, 0, 0);

        [btnUploadAll setTitle:@"Upload All" forState:UIControlStateNormal];
        [btnUploadAll setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        btnUploadAll.titleLabel.font = [UIFont fontWithName:FONT_OPENSAN_SEMIBOLD size:16];
        [btnUploadAll addTarget:self action:@selector(uploadAll:) forControlEvents:UIControlEventTouchUpInside];
        [baseView addSubview:btnUploadAll];

        btnUploadAll.tag = [programId integerValue];

        [btnUploadAll enableAutolayout];
        [btnUploadAll fixWidth:80];
        [btnUploadAll fixHeight:50];

        [btnUploadAll trailingMargin:5];
        [btnUploadAll centerY];

        return baseView;

    }

执行endupdate时会出现上述错误

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    // The fetch controller has sent all current change notifications, so tell the table view to process all updates.
    [tableCart endUpdates];
}