Ensure fails with "bad minute" error

[DenMesh]

await cronbee.ensure({
        taskName: 'test',
        taskRun: 'echo "test"',
        cron: '* * * * *'
});

This code produces the following error:

Error: "-":23: bad minute
errors in crontab file, can't install.

OS is Debian.

While I wasn't able to trace the error all the way, I have a sneaking suspicion that the culprit is line 363 in scheduler/providers/crontab/CronTab.ts.