decodeAudioData example does not work on Safari

[bwl21]

-> https://mdn.github.io/webaudio-examples/decode-audio-data/

does not work on safari (Version 11.0.2 (11604.4.7.1.6) on OSX 10.11.6)

Steps to reproduce

• open https://mdn.github.io/webaudio-examples/decode-audio-data/ on safari
• push "play" button
• nothing happens
• open debugger (ALT-CMD-I)
• you see the point of failure

  request.onload = function() {
    var audioData = request.response;

    audioCtx.decodeAudioData(audioData, function(buffer) {
        myBuffer = buffer;
        songLength = buffer.duration;
        source.buffer = myBuffer;
        source.playbackRate.value = playbackControl.value;
        source.connect(audioCtx.destination);
        //source.loop = true;

        loopstartControl.setAttribute('max', Math.floor(songLength));
        loopendControl.setAttribute('max', Math.floor(songLength));
      },

      function(e){"Error with decoding audio data" + e.err});   //<-- null is not an object

  }

In fact the error callback gets a null parameter.

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[bwl21]

Sorry, did not recognize that I filed this issue in the wrong project. Filed again in mdn/webaudio-examples#5