# Amplitude: Critical incident: Amplitude Experiment Issue with Charts Loading

**Summary:** Amplitude reported a critical Experiment outage: exposure charts failed to load for some flags, and analysis pages failed for some experiments with user-property errors. It started at 2026-03-27 15:52 UTC and was resolved at 2026-03-27 17:11 UTC, lasting 1 h 19 min; Amplitude rolled out a fix. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-03-27 15:52 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/mvrk13qb1vx7](https://stspg.io/mvrk13qb1vx7)
- [Company: Amplitude](https://rewindex.com/company/amplitude.md)
- Versions: before (none: first archived) → after incident\_version:49/51kpvh6wv5rf@59b66f7e1aa2
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ Amplitude Experiment Issue with Charts Loading
```

**2. Added: Impact**

```diff
+ critical
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-03-27 15:52 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-03-27 17:11 UTC
```

**6. Added: Affected components**

```diff
+ Experiment - Web Application, Web Application
```

**7. Added: Update** (investigating) · 2026-03-27 15:52 UTC

```diff
+ For some flags, the exposures chart is not loading properly. For some experiments, the analysis page is not loading properly saying "This experiment's user property is not available yet. It will appear after users are assigned." and "Invalid user property gp:". We are working on a fix.
```

**8. Added: Update** (identified) · 2026-03-27 16:42 UTC

```diff
+ We have identified a fix. We are rolling the fix out.
```

**9. Added: Update** (resolved) · 2026-03-27 17:11 UTC

```diff
+ We have fixed the issue
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-03-27 15:52 UTC | Critical incident: Amplitude Experiment Issue with Charts Loading (this change) | outage |

All Amplitude changes: [timeline](https://rewindex.com/company/amplitude/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/iac4770c5ab8229 · Markdown: https://rewindex.com/change/iac4770c5ab8229.md · JSON: https://rewindex.com/api/v1/changes/iac4770c5ab8229 · Generated 2026-10-18T01:54:24.866Z