# ParentBuildSessionGUID

> The BuildReportSummary.BuildSessionGUID of the build that this build ran inside, or a default-valued GUID if none.

## Definition

* **Type:** Field
* **Namespace:** [UnityEditor.Build](/engine/7000.0/script-reference/unityeditor/build.md)
* **Assembly:** UnityEditor.CoreModule

```csharp
public GUID ParentBuildSessionGUID
```

### Remarks

Recorded for builds started during a Player build or an Addressables build. Use [BuildHistory.TryGetParentBuild](/engine/7000.0/script-reference/unityeditor/build/buildhistory/trygetparentbuild.md) to read it.