Zoom throws error when starting video if you're alone in a meeting

Zoom throws an error when starting the video if you’re alone in the Meeting.

The issue seems related with this line:

 "string" == typeof r.canvas && (r.canvas = document.getElementById(r.canvas))

Where r.canvas will be main-video.

as I’m alone at the meeting, it will not exist a document with the id main-video. Checking the DOM tree I can only find a video with the id "main-video-self.

the code breaks when Zoom tries to access the id of the r.canvas later in the code.

 W = r.canvas.id

the issue doesn’t happen if there is another participant in the meeting.

Browser Console Error

js_media.min.js:1 Uncaught (in promise) TypeError: Cannot read properties of null (reading 'id')
    at e.<anonymous> (js_media.min.js:1:604276)
    at p (js_media.min.js:1:103944)
    at Generator.<anonymous> (js_media.min.js:1:105281)
    at Generator.next (js_media.min.js:1:104307)
    at r (js_media.min.js:1:64601)
    at s (js_media.min.js:1:64812)
    at js_media.min.js:1:64871
    at new Promise (<anonymous>)
    at e.<anonymous> (js_media.min.js:1:64752)
    at e.Notify_MeidaSDK (js_media.min.js:1:653595)

Which Web Meeting SDK version?
3.1.2 and 3.5.2

Meeting SDK Code Snippets

  const onSuccessZoomInit = useCallback(
        meetingConfig: {
          meetingNumber: string | number
          userName: string
          userEmail?: string
          passWord?: string
          customerKey?: string
          tk?: string
          zak?: string
          sdkKey?: string
          signature: string
          recordingToken?: string
        launchInBrowserURL: string,
        ZoomMtg: ZoomMtgType,
      ) =>
      () => {
        initZoomStatus.current = true
          success: onZoomJoinSuccess(ZoomMtg),
          error: (error: unknown) => handleZoomError(error, launchInBrowserURL),
    [handleZoomError, onZoomJoinSuccess],

const meetingConfig = {
          meetingNumber: meetingId,
          passWord: pwd ? pwd : '',
          zak: zak,

          leaveUrl: leaveUrl,
          isSupportAV: true,
          disablePreview: !user,
          success: onSuccessZoomInit(meetingConfig, launchInBrowserURL, ZoomMtg),
          error: (error: unknown) => handleZoomError(error, launchInBrowserURL),

To Reproduce(If applicable)
Steps to reproduce the behavior:

  1. Create a meeting
  2. make sure that you’re the only participant
  3. start video
  4. See error
  • Device: Macbook Pro
  • OS: MacOS 14.4.1
  • Browser: Chrome
  • Browser Version 123.0.6312.87 (Official Build) (arm64)

@thoffart ,

Thank you for sharing your post. I’ve done some testing on the latest sample App , but I’m unable to replicate the behavior you’ve reported. As a next step, you can try using the sample app and let us know if you’re encountering the same issue.