Error "Callback was already called." when setting httpHeaders in mlc_config.json

[ndsvw]

I'm trying to check the links in this file (state 30.10.22): https://raw.githubusercontent.com/luong-komorebi/Awesome-Linux-Software/master/README_pt-BR.md

It works fine as long as I don't set HTTP headers in mlc_config.json.

Command: markdown-link-check ./README_pt-BR.md --config ./mlc_config.json (latest version - 3.10.3)

Result:

FILE: ./README_pt-BR.md
/usr/local/lib/node_modules/markdown-link-check/node_modules/async/dist/async.js:324
if (fn === null) throw new Error("Callback was already called.");
^

Error: Callback was already called.
at /usr/local/lib/node_modules/markdown-link-check/node_modules/async/dist/async.js:324:36
at /usr/local/lib/node_modules/markdown-link-check/node_modules/async/dist/async.js:248:17
at /usr/local/lib/node_modules/markdown-link-check/index.js:129:13
at /usr/local/lib/node_modules/markdown-link-check/node_modules/link-check/lib/proto/http.js:117:21
at done (/usr/local/lib/node_modules/markdown-link-check/node_modules/needle/lib/needle.js:548:14)
at PassThrough. (/usr/local/lib/node_modules/markdown-link-check/node_modules/needle/lib/needle.js:811:9)
at PassThrough.emit (node:events:525:35)
at endReadableNT (node:internal/streams/readable:1359:12)
at process.processTicksAndRejections (node:internal/process/task_queues:82:21)

Node.js v18.11.0

It works fine with this mlc_config.json:

{
  "timeout": "20s",
  "retryOn429": true,
  "retryCount": 5,
  "config-file": "mlc_config.json",
  "fallbackRetryDelay": "60s",
  "aliveStatusCodes": [200, 206, 403]
}

But it crashes with this mlc_config.json that has httpHeaders specified:

{
  "timeout": "20s",
  "retryOn429": true,
  "retryCount": 5,
  "config-file": "mlc_config.json",
  "fallbackRetryDelay": "60s",
  "aliveStatusCodes": [200, 206, 403],
  "httpHeaders": [
    {
      "urls": ["http", ".", "/"],
      "headers": {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36",
        "Upgrade-Insecure-Requests": "1",
        "Connection": "keep-alive",
        "Accept-Language": "en-US,en;q=0.5",
        "Accept-Encoding": "gzip, deflate, br",
        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8"
      }
    }
  ]
}