Getting an unrecognized error, however it's working fine

[s77rt]

Getting an error after making this change:
mediaRecorder.stream.stop();
to:

mediaRecorder.stream.getTracks().forEach(function(track) {
    track.stop();
});

error:

MediaRecorder Error error​bubbles: false​cancelBubble: false​cancelable: false​composed: false​currentTarget: null​defaultPrevented: false​error: Restricted {  }​eventPhase: 0​explicitOriginalTarget: MediaRecorder { stream: LocalMediaStream, state: "inactive", mimeType: "", … }​isTrusted: true​originalTarget: MediaRecorder { stream: LocalMediaStream, state: "inactive", mimeType: "", … }​target: MediaRecorder { stream: LocalMediaStream, state: "inactive", mimeType: "", … }​timeStamp: 15451​type: "error"​__proto__: MediaRecorderErrorEventPrototype { error: Getter, … } MediaStreamRecorder.js:1183:21
	MediaRecorderWrapper/this.start/mediaRecorder.onerror https://cdn.webrtc-experiment.com/MediaStreamRecorder.js:1183:21

even it's working correctly

is it a bug?