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event.data.indexOf is not a function #17

Description

@selected-pixel-jameson

I'm creating a TimingObject instance like so:

 this.timingObject = new TIMINGSRC.TimingObject({ range: [0, 360] });
 await this.timingObject.ready
 
  this.videos.forEach((video, index) => {
    console.log('VIDEO SRC', video.src)
    if (!video.src.includes('#')) {
      this.syncs.push(MCorp.mediaSync(video, this.timingObject));
      if (index !== 0) {
        this.syncs[index].setSkew(0.09);
      }
    }
  })

However, when I play the timingObject.

this.timingObject.update({ velocity: 1.0 });

It throws this error, but the videos do play. I'm just not sure what side affects this error could be causing.

ERROR TypeError: event.data.indexOf is not a function
at Timeout.handleEvent (timingsrc-v2.js:1633:55)
at task.callback (zone.js:1596:1)
at ZoneDelegate.invokeTask (zone.js:406:1)
at Object.onInvokeTask (core.mjs:25505:1)
at ZoneDelegate.invokeTask (zone.js:405:1)
at Zone.runTask (zone.js:178:1)
at ZoneTask.invokeTask [as invoke] (zone.js:487:1)
at invokeTask (zone.js:1600:1)
at globalZoneAwareCaptureCallback (zone.js:1658:1)

Which is referencing this block of code.

```
Timeout.prototype.handleEvent = function (event) {
        if (event.source === window && event.data.indexOf("smalldelaymsg_") === 0) {
            event.stopPropagation();
            // ignore if timeout has been canceled
            var the_tid = parseInt(event.data.split("_")[1]);
            if (this._tid !== null && this._tid === the_tid) {
                this._ontimeout();
            }
        }
    };

Any help or direction in solving this would be really appreciated. 

Thank you.

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