worker crashes sometimes when a connection is opened by the encointer-wallet-app

[clangenb]

Working panics with the following error:

[2021-03-02T18:05:49Z INFO  ws::io] Accepted a new tcp connection from 10.0.0.131:38784.
thread 'main' panicked at 'assertion failed: `(left == right)`
  left: `140007951174624`,
 right: `0`', /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sync/mpsc/shared.rs:251:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
thread '<unnamed>' panicked at 'called `Result::unwrap()` on an `Err` value: "SendError(..)"', worker/src/ws_server.rs:59:26
thread '<unnamed>' panicked at 'assertion failed: `(left == right)`
  left: `140007951174624`,
 right: `0`', /rustc/ffa2e7ae8fbf9badc035740db949b9dae271c29f/library/std/src/sync/mpsc/shared.rs:486:9
stack backtrace:

[lovasoa]

This must be an instance of rust-lang/rust#39364