NSLayoutConstraint animator proxy leads to crashes

Howdy, I've got NSScrollView and NSLayoutConstraint which is defined as: _scrollViewHeightConstraint = [TMIntegralLayoutConstraint constraintWithItem:self.scrollView attribute:NSLayoutAttributeHeight

Re: NSLayoutConstraint animator proxy leads to crashes

Hmm, if I replace beginGrouping/endGrouping/setCompletionHandler: with [NSAnimationContext runAnimationGroup:completionHandler: it doesn't crash if I retain the scroll view until completion handler is called. But anyway, shouldn't NSLayoutConstraint handle this? -- Robert @ Tapmates, Inc.