UPDATE: (sorry, cannot find how to edit my post, so will comment here) we have found what the problem is, we are using the WebView from WebKit to show related Wikipedia articles, and any user who is trying to save a picture from that web-page would get this crash, unless and until we put a record with NSPhotoLibraryAddUsageDescription into Info.plist PS to admins: if it is better to delete this post, I can do it, just thought somebody else might benefit from it, too, thanks!