Receive a SIGSEGV(Address boundary error) while executing Proxy example code.

[Hacksign]

Describe the bug I've done some modification of this example(code is pasted under Reproducing section):

http://zeromq.github.io/zeromq.js/classes/proxy.html

Then execute it. After about 20s, there is a segment fault error:

fish: './node_modules/.bin/ts-node ./l…' terminated by signal SIGSEGV (Address boundary error)

Reproducing

hacksign@XSignLaptop [09:56:49] : ~/Code/blogstation/blog-station 
>> ./node_modules/.bin/ts-node ./libmq/zmq-proxy.ts 
fish: './node_modules/.bin/ts-node ./l…' terminated by signal SIGSEGV (Address boundary error)
hacksign@XSignLaptop [09:57:22] : ~/Code/blogstation/blog-station 
>> cat ./libmq/zmq-proxy.ts 
import { Proxy, Router, Dealer } from 'zeromq';

const proxy = new Proxy(new Router, new Dealer)
proxy.frontEnd.bind("tcp://*:5559")
.then(
  () => proxy.backEnd.bind("tcp://*:5560").then(
    () => {}
  )
).then(
  () => proxy.run()
);

Still got same error, after modified like this:

import { Proxy, Router, Dealer } from 'zeromq';

const proxy = new Proxy(new Router, new Dealer)
proxy.frontEnd.bind("tcp://*:5559")
.then(
  () => proxy.backEnd.bind("tcp://*:5560").then(
    () => {}
  ).then(
      () => proxy.run()   // avoid async problems....
  )
);

Expected behavior The process keep running until terminated manually.

Tested on

• OS:

Archlinux 5.8.12-arch1-1

• ZeroMQ.js version: [e.g. 5.1.0, 6.0.0-beta.2]

"zeromq": "^6.0.0-beta.6"

• Node version:

v14.13.0