Crash on behavior.scrollViewWillEndDragging call in v3.1.1

[mouchegmouradian]

After updating to v3.1.1 the app crashes when releasing finger after a swipe. It works without any change with the 2 previous versions.

• The crash happens on the behavior.scrollViewWillEndDragging call
• behavior is not nil

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
        behavior.scrollViewWillEndDragging(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
}

Didn't see anything in the changelogs that would explain this sudden crash.

Any ideas why this is happening ?