AutoLayout views make app crash on popViewController

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Just putting this here in case anyone has the same issue with a dynamic, code-generated aspectRatio constraint. I switched the order of the Height and Width relationship in the aspect-ratio constraint (compare to the one in the question):

aspectConstraint = NSLayoutConstraint(item: cardMedia, attribute: NSLayoutAttribute.Height , relatedBy: NSLayoutRelation.Equal, toItem: cardMedia, attribute: NSLayoutAttribute.Width, multiplier: aspect, constant: 0.0)

Where the multiplier aspect is calculated by:

let aspect = image.size.height / image.size.width

And that seems to stop the crash from happening. Hope this helps someone.

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