Thanks for you reply. titleLbl == UILabel Issue exactly in UICollectionViewCell in prepareForReuse(), not in VC. And we are not using xibs - all UI are created programmatically. Issue in Simulator and Device compiled by XC13. Main problems one more time: All works fine on XC12 on simulator and devices. No issues or some sort of problems at all. But only on XC13 after compile we have this magic. Issue cant be founded via debugger because all variable are alive, views have superviews, windows, etc. Just exc_bad_access and thats all, and one more thing. Label attrString changes to nil, before it has some text. If i comment problematic line, it will crash on another label with attrStr and etc.