Uncoiled Popover look from UICollectionView

I have a data matrix (of players) displayed in UICollectionView. I want the player information to be displayed in a popup view when the user touches the cell. I asked this question before and got it to work. But since then a strange problem has arisen.

When I touch the cell, a pop-up window appears, but the main view turns off two screens (!?), And the application crashes with this error: "The application terminated due to the unselected exception" NSGenericException ", reason: '- [UIPopoverController dealloc] reached while popover is still displayed.

PlayerDataView is built into the storyboard. I declared both the playerDataView controller and the popover view controller as properties of the collection view in its header file:

@property (strong, nonatomic) UIPopoverController *playerDataPopover;
@property (strong, nonatomic) SWSPlayerDataViewController *playerDataView;

Here is the code that creates the popover instance:

- (IBAction)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.row == 0 || indexPath.section == 0) {  // Ignores user selecting row or column headers that I've placed in the collection view data
        return;
    }
    [self.collectionView deselectItemAtIndexPath:indexPath animated:NO];
    CGRect anchorRect = [collectionView layoutAttributesForItemAtIndexPath:indexPath].frame;
    self.playerDataView = [self.storyboard instantiateViewControllerWithIdentifier:@"playerDataView"];
    self.playerDataView.player = self.players[indexPath.section][indexPath.row]; // Sets player data in popover view.
    self.playerDataPopover = [[UIPopoverController alloc] initWithContentViewController:self.playerDataView];
    [self.playerDataPopover presentPopoverFromRect:anchorRect inView:self.collectionView permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

I can understand why I get this error if there is a promotion from the collection view, but I can not understand why the unwinding occurs. Any ideas?