YAMLException unacceptable kind of an object to dump [object Undefined]

[adymorz]

Tests are running using gulp (5.0.0), ava (6.1.3) and execa (9.1.0). I recently updated those packages, but the error also occurred before, so the error is not directly related to those specific versions.

The code to run the test looks like this:

await execa("npx", [
	"ava",
	"tests/*,
	"--concurrency",
	parseInt(argv["ava-concurrency"]),
	argv["ava-failfast"] === true ? "--fail-fast" : null,
	"--tap",
	"--timeout",
	"30m"
], {
	env: {
		AVA_BROWSER: argv["ava-browser"],
		AVA_HEADLESS: argv["ava-headless"],
		AVA_PRESERVE_DB: argv["ava-preserve-db"],
		AVA_SKIP_SCREENSHOTS: argv["ava-skip-screenshots"],
	},
	stdout: [
		process.stdout,
		{file: "tests/output/tapOutput.txt"}
	]
});

Sporadically the following error gets thrown:

Command failed with exit code 1: npx ava tests/* --concurrency 4  --tap --timeout 5m

C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:779
      throw new YAMLException('unacceptable kind of an object to dump ' + type);
            ^
YAMLException: unacceptable kind of an object to dump [object Undefined]
    at writeNode (C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:779:13)
    at writeBlockMapping (C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:657:10)
    at writeNode (C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:750:9)
    at dump (C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:840:7)
    at Object.safeDump (C:\Users\some-path\node_modules\js-yaml\lib\js-yaml\dumper.js:846:10)
    at Module.test (file:///C:/Users/some-path/node_modules/ava/node_modules/supertap/dist/index.js:46:49)
    at TapReporter.writeTest (file:///C:/Users/some-path/node_modules/ava/lib/reporters/tap.js:99:36)
    at TapReporter.consumeStateChange (file:///C:/Users/some-path/node_modules/ava/lib/reporters/tap.js:203:10)
    at file:///C:/Users/some-path/node_modules/ava/lib/reporters/tap.js:68:45
    at file:///C:/Users/some-path/node_modules/emittery/index.js:365:13 {
  reason: 'unacceptable kind of an object to dump [object Undefined]',
  mark: undefined
}

Node.js v20.10.0

Do you have an idea how to find the root cause of this issue?