Help with Parsing XML in iOS

I'm having a problem with my app, I'm attempting to save stuff in core data by copying a label, but its giving me this error

Terminating app due开发者_如何学运维 to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString appendString:]: nil argument'

This is the code

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{


    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
    }



    ClientDownload *currentClientDownload = [[xmlClientDownloadParser clientArray] objectAtIndex:indexPath.row];


    CGRect contentFrame = CGRectMake(45, 2, 265, 30);
    clientName = [[[UILabel alloc] initWithFrame:contentFrame] autorelease];
    clientName.numberOfLines = 2;
    clientName.font = [UIFont boldSystemFontOfSize:12];
    clientName.text = [currentClientDownload NAME];
    [cell.contentView addSubview:clientName];

    CGRect detailFrame1 = CGRectMake(45, 40, 265, 30);
    clientMobile = [[[UILabel alloc] initWithFrame:detailFrame1] autorelease];

    CGRect detailFrame2 = CGRectMake(45, 40, 265, 30);
    clientAccount = [[[UILabel alloc] initWithFrame:detailFrame2] autorelease];

    clientAccount.font = [UIFont systemFontOfSize:10];
    clientAccount.text = [currentClientDownload ACCOUNT];
    clientMobile.font = [UIFont systemFontOfSize:10];
    clientMobile.text = [currentClientDownload MOBILE];


    [cell.contentView addSubview:clientAccount];
    [cell.contentView addSubview:clientMobile];

    NSLog(@"SaveData");
    Clients *client = (Clients *)[NSEntityDescription insertNewObjectForEntityForName:@"Clients" inManagedObjectContext:managedObjectContext];
    if( (clientName.text) || (clientAccount.text) || (clientMobile.text) != NULL)
    {   
        client.ACCOUNT = clientAccount.text;
        client.NAME = clientName.text;
        client.MOBILE = clientMobile.text;
        NSLog(@"CLIENT GENERATED");
        NSError *error;

        if (![managedObjectContext save:&error])
        {
            NSLog(@"Problem saving: %@", [error localizedDescription]);
        }

 }
    NSError * error;
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Clients" inManagedObjectContext:managedObjectContext];
    [fetchRequest setEntity:entity];
    NSArray *fetchedObjects = [managedObjectContext executeFetchRequest:fetchRequest error:&error];


    for (NSManagedObject *info in fetchedObjects)

    {

        NSLog(@"ACCOUNT: %@",[info valueForKey:@"ACCOUNT"]);
        NSLog(@"NAME: %@",[info valueForKey:@"NAME"]);
        NSLog(@"MOBILE: %@",[info valueForKey:@"MOBILE"]);

    }   

    [fetchRequest release];
    return cell; 

}

As I see you have wrong if-statement here:

    if( (clientName.text) || (clientAccount.text) || (clientMobile.text) != NULL)

It should look like this one (if I'm not mistaken):

    if( (clientName.text != NULL) && (clientAccount.text != NULL) && (clientMobile.text != NULL))

In your if statement, you are checking all three UILabels for zero text at the same time. That means, if there is text in one of them and the other two are empty, the if condition will return YES. You then try to assign this empty text to your custom object.

You should revise your if statements to refer to each field separately. Thus:

if (clientAccount.text != nil)  client.ACCOUNT = clientAccount.text;
if (clientName.text != nil)     client.NAME = clientName.text;
if (clientMobile.text != nil)   client.MOBILE = clientMobile.text;

If this does not fix it, please post the exact line where you get the crash.