Terminating app due to failure in assertBarrierOnQueue threading violation: expected the main thread

Question

My app is getting crashed when App is in backGround and i received webrtc call from Notification.

 func appClient(_ client: ARDAppClient!, didChange state: RTCIceConnectionState) {
    switch state {
    case .connected:
        
        let audioSession = AVAudioSession.sharedInstance()
        if (delegate != nil){
            delegate?.appClientStatus!(client, status: .connected)
        }
        captureController?.startCapture()
        
 
        do {
            try audioSession.overrideOutputAudioPort(.speaker) // App is crashing here
        } catch _ {
            
        }
        
        break
    case .disconnected:
        if (delegate != nil){
            delegate?.appClientStatus!(client, status: ARDAppClientState.disconnected)
        }
        print("disconnected ICE")
        break
    default:
        break
    }
}

I've tried different ways and patches

• Main thread

  DispatchQueue.main.async {
        do{
            try audioSession.setCategory(.playAndRecord)
            try audioSession.overrideOutputAudioPort(AVAudioSession.PortOverride.speaker)
        }catch let error{
            print(error.localizedDescription)
        }
  }
  

• setActive

     do {
       try audioSession.setActive(true)
     } catch _ {
  
     }
     do {
      try audioSession.setCategory(.playAndRecord)
     } catch _ {
     }
  
     do {
        try audioSession.overrideOutputAudioPort(.speaker)
     } catch _ {
  
     }
  

From below reference -

AVAudioSession - How to switch between speaker and headphones output

Force audio file playback through iPhone loud speaker using Swift

But still app is getting crashed and throwing below error:-

• error

failure in assertBarrierOnQueue of FBSSerialQueue:0x28294f100 (FBSSerialQueue.m:121) : threading violation: expected the main thread