Cannot form weak reference to instance

[AlleniCode]

Storyboard TableViewController

When pop viewController it crashed here.

[AlleniCode]

Just crashed on UITableViewController, works well on UIViewController.

[AlleniCode]

override open func willMove(toSuperview newSuperview: UIView?) {
		super.willMove(toSuperview: newSuperview)

		// Set colors for proper positions
		self.configureThumbColors()
		self.configureTrackColors()

		// set initial position
        if newSuperview == nil {
            self.changeThumbState(on: isOnPrivate, animated: false, sendAction: false)
        } else {
            self.changeThumbState(on: isOnPrivate, animated: false, sendAction: true)
        }
	}