See https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://www.npmjs.com/package/angular-ts-manage
no release, no revision, and no full visit.
Most likely related to [1]
[1] https://sentry.softwareheritage.org/organizations/swh/issues/?query=is%3Aunresolved+cannot+be+converted+to+text&statsPeriod=90d