IOS crash after permission left on Ionic 3

[texano00]

Expected Behaviour

After permission left on IOS it wouldn't crash.

Actual Behaviour

After permission left on IOS, the plugin crash with com.apple.coreaudio.avfaudio', reason: 'required condition is false: nullptr == Tap()'. Then, if i restart the app (permission already left) it works.

Reproduce Scenario (including but not limited to)

Platform and Version (eg. Android 5.0 or iOS 9.2.1)

iOS 11.3

Cordova CLI version and cordova platform version

ionic info

    @ionic/cli-plugin-proxy : 1.5.8
    @ionic/cli-utils        : 1.19.2
    ionic (Ionic CLI)       : 3.20.0

global packages:

    cordova (Cordova CLI) : 8.0.0 

local packages:

    @ionic/app-scripts : 3.1.8
    Cordova Platforms  : android 7.1.0
    Ionic Framework    : ionic-angular 3.9.2

System:

    Android SDK Tools : 26.1.1
    Node              : v8.11.1
    npm               : 6.0.1 
    OS                : Linux 4.13

Sample Code that illustrates the problem

import { Platform } from 'ionic-angular';

declare const SpeechRecognition: any;

@Injectable()
export class HomeService {
  isRecording: boolean = false;
  recognition: any;

  constructor(public platform: Platform) {
    this.platform.ready().then(() => {
      this.recognition = new SpeechRecognition();
      this.recognition.continuous = true;
      this.recognition.interimResults = false;
      this.recognition.lang = 'it-IT';
    });
  }

  startListening() {
    if (!this.isRecording) {
      this.isRecording = true;
      this.recognition.start();
    }
  }

  stopListening() {
    return new Promise((resolve, reject) => {
      const that = this;
      this.recognition.onresult = function(event) {
        if (event.results[0][0].transcript !== undefined) {
          const string = event.results[0][0].transcript;

          if (typeof string === 'string') {
            console.log(string);
            resolve(string);
          }
        }
      };
      this.recognition.stop();
      that.isRecording = false;
    });
  }
}

In my code on press of a button i call startListening() then after release the stopListening() method.

Logs taken while reproducing problem

com.apple.coreaudio.avfaudio', reason: 'required condition is false: nullptr == Tap()'