iOS แก้ไขอย่างไรครับ ดึงข้อมูลจากดาต้าเบส MSSQL แล้ว Error "data parameter is nil"

- (void)viewDidLoad
{
    [super viewDidLoad];
    

    prodcode = @"Prodcode";
    images = @"Images";
    
    myObject = [[NSMutableArray alloc]init];
    
    NSData *jsonData = [NSData dataWithContentsOfURL:
                        [NSURL URLWithString:@"http://10.32.1.151:81/sample_shoe/GetData.php"]];

    id jsonObjects = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:nil];
    
 
    //values in foreach loop
    for (NSDictionary *dataDict in jsonObjects)
    {
        NSString *strProdCode = [dataDict objectForKey:@"prodcode"];
        NSString *strImages = [dataDict objectForKey:@"images"];
        
        dict = [NSDictionary dictionaryWithObjectsAndKeys:
                strProdCode,prodcode,
                strImages,images,
                nil];
        
        [myObject addObject:dict];
    }
    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    if (cell == nil)
    {
      cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }
    
    
    NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];
    
    NSURL *url = [NSURL URLWithString:[tmpDict objectForKey:images]];
    NSData *data = [NSData dataWithContentsOfURL:url];
    UIImage *img = [[UIImage alloc]initWithData:data];
    cell.imageView.image = img;
    
    cell.textLabel.text = [tmpDict objectForKey:prodcode];
    
    return cell;
}