Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[12]'

@property (weak, nonatomic) IBOutlet UILabel *cellLabel;
@property (weak, nonatomic) IBOutlet UIImageView *cellImages;

@property (weak, nonatomic) IBOutlet UICollectionView *cView;
@property (nonatomic, strong) NSArray *themeLabels;
@property (nonatomic, strong) NSArray *themeImages;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.cView.dataSource = self;
    self.cView.delegate = self;
    self.themeLabels = [[NSArray alloc] initWithObjects:@"Default", @"Peacock", @"Purple", @"Rainbow", @"Multi Zebra", @"Green", @"Marble", @"Prosperity", @"Leopard", @"Circle", @"Slanted", @"Orange", @"Reddish", nil];
    NSLog(@"The themes are %@", self.themeLabels);

    self.themeImages = @[[UIImage imageNamed:@"Newiphonebackground.png"], [UIImage imageNamed:@"peacock.png"], [UIImage imageNamed:@"Purplepink.png"], [UIImage imageNamed:@"Rainbow.png"], [UIImage imageNamed:@"PinkZebra.png"], [UIImage imageNamed:@"Greenish.png"], [UIImage imageNamed:@"MarblePrint.png"], [UIImage imageNamed:@"Prosperity.png"], [UIImage imageNamed:@"leopard.png"], [UIImage imageNamed:@"CircleEffect.png"], [UIImage imageNamed:@"RedSlanted.png"], [UIImage imageNamed:@"Orange3.png"], [UIImage imageNamed:@"ReddishBack.png"]];
}

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return [self.themeLabels count];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    ThemeCell *themeCell = (ThemeCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"Theme Cell" forIndexPath:indexPath];
    NSString *cellData = [self.themeLabels objectAtIndex:indexPath.row];
    themeCell.cellLabel.text = cellData;
    themeCell.cellImages.image = self.themeImages[indexPath.row];
    return themeCell;
}

themeCell.cellImages.image = self.themeImages[indexPath.row];