# Error in stream.startVideo()

**URL:** <https://devforum.zoom.us/t/error-in-stream-startvideo/63893>\
**Category:** Web\
**Tags:** dc\
**Created:** [February 7, 2022, 9:06am UTC](https://devforum.zoom.us/t/error-in-stream-startvideo/63893 "2022-02-07T09:06:55Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![puvivinocmv](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/puvivinocmv/32/34241_2.png) [@puvivinocmv](https://devforum.zoom.us/u/puvivinocmv)\
**Post date:** [February 7, 2022, 9:06am UTC](https://devforum.zoom.us/t/error-in-stream-startvideo/63893/1 "2022-02-07T09:06:55Z")

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**af190b91-7c0e-458b-8d31-9d305fd29415:1 Uncaught TypeError: Cannot read properties of undefined (reading ‘addEventListener’)**  
\*\* at E.webGLContextLostProtect (af190b91-7c0e-458b-8d31-9d305fd29415:1:154172)\*\*  
\*\* at E.Get\_Display (af190b91-7c0e-458b-8d31-9d305fd29415:1:155342)\*\*  
\*\* at af190b91-7c0e-458b-8d31-9d305fd29415:1:139156\*\*

Hi team, I’m getting the above issue in stream.startVideo() method. I’m working creating multiple session using different topics and signature over a same client to achieve breakout room. for that I’m following the below steps,

1. We will create a main session using a topic ( ex topic: main\_session)

2. users will be joining in the main session

To start breakout session

1)Users will leave the main session and join the break out session with new topic. ( ex topic: breakout\_session).

1. When breakout session ends, Users will be joining to the main session using the existing topic. ( ex topic: main\_session)

I’m getting error while user return to main room in stream.startVideo() function.

Can you please help me on this ?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [March 9, 2022, 7:07pm UTC](https://devforum.zoom.us/t/error-in-stream-startvideo/63893/2 "2022-03-09T19:07:05Z")

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