meet a crash "objc_release + 16", only for iPhone X & early devices running iOS 14.0+

I've got a crash with our app running online, which only happened on devices such as iPhone X & earlier series running iOS 14.0+, any help is appreciated.

crash log : link
Do you define observers in AppDelegate (in appDidFinishLaunching for instance) ?

Could you show your code ?
meet a crash "objc_release + 16", only for iPhone X & early devices running iOS 14.0+
 
 
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