# Sites are failing intermittently with 500 Internal Server Error

- Provider: [GitBook](https://down.guide/gitbook)
- Level: confirmed
- Impact: Partial outage
- lasted 1h 17m
- started 2026-06-22 14:58 UTC
- id: DWN-14c6d949de
- Official page: https://www.gitbookstatus.com/incidents/01KVQXDDA20704WB9MHH9KDV0P

## Updates from GitBook
### 2026-06-22 14:58 UTC: identified
The issue affects some sites, resulting in Internal Server Error when visiting a site. We have identified a cause and expect to have a fix in near future. Not all sites are affected due to caching.

### 2026-06-22 15:21 UTC: monitoring
As part of the reorderable page actions last week we migrated \`pageActions\` into a new shape and removed old values. Our published content wasn't properly updated to no longer check the old values, and thus errored out because it was checking data that wasn't there (depending on what version of the customization object you were served, some sites were still using the old shape and thus functioned).
We're mitigating by properly checking both data shapes for the foreseeable future, until all sites are completely using the new format.

### 2026-06-22 16:14 UTC: resolved
The fix released has solved the issue, all systems should be operational now.

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