无法找到崩溃的原因 - [UIScrollView（UIScrollViewInternal）_scrollViewAnimationEnded：finished：]

In my app many crashes with the following log are reported very often, but even with several test devices and iOS versions I am not able to reproduce it. So there's no way to find the reason on Xcode. Because there's no step in the trace, that leads to my code, I cannot imagine any way to find the origin of it. The App itself is very complex and of course many Scroll Views, also embedded, are used. In my app many crashes with the following log a