title: specialized AppDelegate.applicationWillTerminate(_:) + 13348544
body: <p>In XCode organizer,see the crashes of my app. There are many crashes on iOS15.I can't reproduce it on my iOS15 device. I guess it crashed when the application on the background because the log shows the app delegate terminate function time and crash time. The crash log is in the attachment. I cannot get some useful info from the log. can you help me, please</p>
  <p><a href="https://i.stack.imgur.com/IuPCz.jpg" rel="nofollow noreferrer">Xcode Organizer screens</a>
  <a href="https://i.stack.imgur.com/Xju4W.png" rel="nofollow noreferrer">Error captured from firebase</a></p>