javascript Uncaught TypeError: Cannot read property 'addEventListener' of null

[coresh]

During jitsi-meet page loading:

javascript chromium console output:

Uncaught TypeError: Cannot read property 'addEventListener' of null

jitsi-meet loading process: stoped

modules/UI/side_pannels/SideContainerToggler.js:22

...
19         // Adds a listener for the animation end event that would take care                                             
20         // of hiding all internal containers when the extendedToolbarPanel is                                           
21         // closed.                                                                                                      
22         document.getElementById("sideToolbarContainer")                                                                 
23             .addEventListener("animationend", function(e) {                                                             
24                 if(e.animationName === "slideOutExt")                                                                   
25                     $("#sideToolbarContainer").children().each(function() {                                             
26                         if ($(this).hasClass("show"))                                                                   
27                             SideContainerToggler.hideInnerContainer($(this));                                           
28                     });                                                                                                 
29             }, false);                                                                                                  
30     },

...

[damencho]

Could you please use the mailinglist for problems or questions, before opening issue.

I suppose the browser is chrome. Are you experiencing this on meet.jit.si, or it is some other deployment, does it contain changes?

[coresh]

Dear @damencho , you are quite right.
It's backend issue.
javascript reproduced 'Uncaught TypeError' due to the html not loaded properly