'error' event is not returning any message for invalid decoding

[gilpanal]

Bug description

Try to load a not supported type of audio, like .ogg in Safari
The error event is triggered but the content of the message is undefined.
It seems also that the event throws the error message correctly later when tries to load a different file that is compatible

Environment

• Browser: Any

Minimal code snippet

<script src="https://unpkg.com/wavesurfer.js@7"></script> 

wavesurfer.load('assets/audio/wrong_format.m4a');

wavesurfer.on('error', (error) => {
  console.log(error)
  // try to load a different file after the error
   wavesurfer.load('assets/audio/sample.mp3');
});

Easy to reproduce by running the following repo, changing the library version in the index.html and adding the error event handler snippet code above:

https://github.com/HassanCorrigan/soundcloud-player

Expected result

With the following previous version it works as expected:

 <script src="https://unpkg.com/[email protected]/dist/wavesurfer.js"></script>

Outoput: "Error decoding audiobuffer"

In the current version it should be the following message
EncodingError: Unable to decode audio data

Obtained result

undefined

NOTE: after that, if another compatible audio file is loaded then the message is displayed in the error handler event but it shouldn't

Screenshots