Steps to reproduce:
1. Create new Unity project using High Definition 3D Template
2. Enter Play Mode
3. Use shortcut “Control+Backspace” to use play mode debug UI
4. Exit Play mode
5. Observe the Console window  

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Actual results: NullReferenceException” errors thrown in the Console
Expected results: No errors are thrown in the Console

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Reproducible with versions: 6000.5.0a9 (253a859729df), 6000.5.0b1, 6000.6.0a1
Not reproducible with versions: 6000.3.12f1, 6000.4.1f1, 6000.5.0a8 (d36222f39966)

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Tested on (OS): macOS Silicon Tahoe 26.3.1 (M1)

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Error:
{code:java}
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Rendering.RuntimeDebugWindow.OnDestroy () (at ./Library/PackageCache/com.unity.render-pipelines.core@a7701cc1a9a1/Runtime/Debugging/RuntimeDebugWindow.cs:142)
{code}