step-06- message.type==='offer'

[nalibjchn]

1. open first page with http://localhost:8080/#d25165e54d9d0, there is no issue.
2. open a new tag or page by using the same url (http://localhost:8080/#d25165e54d9d0), there is an issue below,
   this issue is in socket.on('message', function(message){
   if (message.type == 'offer') {
   })
   for a while, the server shows the message: Peer or server disconnected. Reason: ping timeout.
   ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
   Uncaught TypeError: Cannot read property 'type' of null
   at r. (main.js:98)
   at r.emit (index.js:83)
   at r.onevent (index.js:83)
   at r.onpacket (index.js:83)
   at r. (index.js:83)
   at r.emit (index.js:83)
   at r.ondecoded (index.js:83)
   at a. (index.js:83)
   at a.r.emit (index.js:83)
   at a.add (index.js:83)
   ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

please check it what the issue is, other codes I ran very well.