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

- Provider: [Census](https://down.guide/census)
- Level: confirmed
- Impact: Degraded
- lasted 2h 19m
- started 2025-11-12 17:41 UTC
- Sync Engine
- id: DWN-197041aa22
- Official page: https://stspg.io/trktfj5ddtt7

## Updates from Census
### 2025-11-12 17:41 UTC: identified
The issue has been identified and a fix is being implemented.

### 2025-11-12 18:30 UTC: monitoring
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.

### 2025-11-12 18:30 UTC: monitoring
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.

### 2025-11-12 20:01 UTC: resolved
This incident has been resolved.

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