iOS 8 multiple popovers - "Warning: Attempt to present * on * which is already presenting (null)"

Question

I have two UIBarButtonItem which both open up a popover with a navigation controller in my iOS 8 app. Both are setup using storyboards and are of type Present As Popover and "Animates" set to true. "Anchor" is set to corresponding UIBarButtonItem.

In code this is the configuration before presenting the popover / performing segue.

override public func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
   if segue.identifier == SEGUE_ID_ADD_ACTION {
        if let actionViewController = (segue.destinationViewController as! UINavigationController).topViewController as? ActionViewController {
            let newAction = Action()
            actionViewController.selectedAction = newAction
            actionViewController.delegate = self
        }
    }
    else if segue.identifier == SEGUE_ID_FILTER {
        let controller = (segue.destinationViewController as! UINavigationController).topViewController as! FilterViewController
        controller.delegate = self
        controller.setup(filter)
        segue.destinationViewController.popoverPresentationController!.delegate = controller
    }
}

Both shown view controller classes have no more popover specific code more than:

let size = CGSizeMake(320, 460)
self.navigationController?.preferredContentSize = size

in viewWillAppear

The problem I have is that when popover A is presented and I press the button to open popover B. An error is shown in log and nothing happens. Preferably popover B should be show or at lease hide popover B (similar to clicking anywhere else outside the popover). Error in log:

 Warning: Attempt to present <UINavigationController: 0x7fbdac027000>  on <xxx.ActionListViewController: 0x7fbdac075000> which is already presenting (null)

Answer 1

Adding

self.navigationController?.popoverPresentationController?.passthroughViews = nil

in the containing viewcontroller in the popover at least fixed so when clicking another button in the navigationitem did trigger a dismiss of the other popover.