Deploy R shiny app on LAN: Uncaught TypeError: Cannot read property 'readyState' of null

[Ankush]

Hi all,
I have created an application in the R shiny. Few days back, it was working well. But now it starts crashing. There's no error in the R console.

But in Chrome, it is showing-

shinyapp.js:288 Uncaught TypeError: Cannot read property 'readyState' of null
at ShinyApp.$sendMsg (shinyapp.js:288)
at ShinyApp.sendInput (shinyapp.js:140)
at InputBatchSender.$sendNow (input_rate.js:220)

Can anybody tell me whats it is and How to overcome this?

[nirgrahamuk]

It is not likely that this error can be fixed without a reproducible example.
If I was trying to address this I would try to eliminate various parts of the code, until I had the smallest code that stil exemplified the javascript error, then perhaps raise an issue about it on the shiny github.

[DGranjon]

In the shinyapps.js code there is line 285 (https://github.com/rstudio/shiny/blob/master/srcjs/shinyapp.js#L285):

if (!this.$socket.readyState)

Your error means that $socket does not exist (it has been prematurely closed). See my screenshot where I manually closed the connection and then try to access the socket again.

Where is your app deployed? Do you have any REPREX?

[Ankush]

Thanks , it worked...........

[micahwilhelm]

What do you mean, "it worked"?
What solution did you implement??

[Ankush]

I just looked on the solution as mentioned by @DGranjon. Then, cleared my environment, restarted the application and it ran!