Black Screen of Death (ClassNames is not defined)

I’m encountering a serious production issue with the Web Client SDK during a Webinar we’re running. Participants of a meeting are getting kicked out with a black screen.

Web Client SDK 1.9.5

With the errors

cancelConsume interval 3 requestId null
destroy SDK
ReferenceError: ClassNames is not defined"

edit: happened on receive of this data packet

I want to add that when this happens, it appears to knock off a significant portion of participants at the same time.

Hey @ckarpyszyn,

Thank you for reaching out to the Zoom Developer Forum. Please send an email to with a link to this thread.

In that email, please include a Webinar ID where you saw this.


Just to correct myself, it was a meeting. I’ve sent an email out with the meeting Id. Thanks Max.

1 Like

Hey @ckarpyszyn,

Thank you for creating a ticket! We’ll keep an eye out for it.


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