private var synthesizer: AVSpeechSynthesizer? this is my variable. i have in deinit:   deinit {        synthesizer?.delegate = nil        synthesizer = nil     } when i comment synthesizer = nil crash app not crashed

private var synthesizer: AVSpeechSynthesizer? deinit {         self.synthesizer?.delegate = nil         //this is comment  for ios 16+ if not app crashed        //synthesizer = nil     } when synthesizer = nil my app is crashed when comment this line all work ok