# Incident Report 23/01/2026

**Start:** `Jinn/3.12.10`(Jan 22, 2026, 11:01:23 AM UTC+2:00)

**End:** `Jinn/3.12.11` (Jan 23, 2026, 16:00:00 AM UTC+2:00)

**Reach:** Using one Microsoft service with certain configurations triggers a Studio crash.

**Impact:** High – blocking

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## Description

After adding and configuring a `Microsoft Graph - Sites` step, the Studio crashes and displays the following error message::

```jsx
Could not find anyOf index, path:PARAM-XXXXXXXX.fields
```

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## Causes

An internal JSON Schema representing the `Create a new item in a list` action in the `Microsoft Graph - Sites` service used a specific pattern to represent _nullability_. One of our utility functions did not correctly support this pattern. The function retrieves a nested schema based on a path and parent schema. It raised an exception, causing the application to crash.

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## Resolution

We have hardened the utility function to support this specific JSON schema pattern.

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## Follow-up

We sincerely apologize for this disruption and are committed to preventing similar issues in the future.