# Census: Subset of syncs are failing with, "Passed `nil` into T.must"

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-11-12 17:41 UTC · Resolved: 2025-11-12 20:01 UTC · Duration: 2.3 h
- Updates: 4 · Affected components: Sync Engine
- [Vendor status page: https://stspg.io/trktfj5ddtt7](https://stspg.io/trktfj5ddtt7)
- [Company: Census](https://rewindex.com/company/census.md)

## Timeline of updates

- **identified** 2025-11-12 17:41 UTC: The issue has been identified and a fix is being implemented.
- **monitoring** 2025-11-12 18:30 UTC: The error impacting some customer syncs has now been resolved and syncs are recovering.  The syncs impacted were runs with no new data changes to process. This happened due to a recent update that removed the part of our system that correctly handled "no change" scenarios. As a result, syncs without updates failed instead of completing successfully. Syncs with actual data changes were unaffected. We've rolled back the change, and all syncs are now running normally.
- **monitoring** 2025-11-12 18:30 UTC: The error impacting some customer syncs has now been resolved and syncs are recovering.  The syncs impacted were runs with no new data changes to process. This happened due to a recent update that removed the part of our system that correctly handled "no change" scenarios. As a result, syncs without updates failed instead of completing successfully. Syncs with actual data changes were unaffected. We've rolled back the change, and all syncs are now running normally.
- **resolved** 2025-11-12 20:01 UTC: This incident has been resolved.


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Canonical: https://rewindex.com/company/census/incidents/9z2zcw2kft1n · Markdown: https://rewindex.com/company/census/incidents/9z2zcw2kft1n.md · JSON: https://rewindex.com/api/v1/companies/census/incidents/9z2zcw2kft1n · Generated 2026-10-18T11:36:08.132Z