Using ktor websockets in browser. Noticed sometime...

# ktor

[PHondogo]

Using ktor websockets in browser. Noticed sometimes error in console.
What can be the cause? How to dig?

IllegalStateException: Already resumed, but proposed with update CompletedExceptionally[io.ktor.client.plugins.websocket.WebSocketException: {"target":{},"type":"error","isTrusted":true}]

[Aleksei Tirman [JB]]

Can you please share the complete stack trace?

[PHondogo]

It's the production build. No valuable info in it

Uncaught IllegalStateException: Already resumed, but proposed with update CompletedExceptionally[io.ktor.client.plugins.websocket.WebSocketException: {"target":{},"type":"error","isTrusted":true}]
    createJsError <http://192.168.0.2:8080/app.wasm.js:2>
    764/</web.streams.__convertKotlinClosureToJsClosure_((Js)->Unit)/< <http://192.168.0.2:8080/app.wasm.js:2>
Caused by: null
app.wasm.js:2:375526

[PHondogo]

Its happens when while web page opened put laptop to hibernation and resume

[Aleksei Tirman [JB]]

Unfortunately, I cannot reproduce the exception, but it seems the exception is thrown here, which may happen if the CompletableDeferred was already completed within the onclose callback.

[PHondogo]

It seems like error event happens more then once? Is it possible to handle it (or suppress if not critical) on user side?

[Aleksei Tirman [JB]]

I've filed an issue KTOR-9361 to address this problem. Can you please try wrapping the websocket call in a try/catch block to catch the exception?

[PHondogo]

Wrapping with try/catch didn't help. May be this event is triggering internally in other coroutine.

[Aleksei Tirman [JB]]

Then, unfortunately, the issue can be fixed only on our side.