diff --git a/com.unity.render-pipelines.core/Runtime/Debugging/DebugUI.Fields.cs b/com.unity.render-pipelines.core/Runtime/Debugging/DebugUI.Fields.cs
index b6a1f5df4d5..d2005a63f8a 100644
--- a/com.unity.render-pipelines.core/Runtime/Debugging/DebugUI.Fields.cs
+++ b/com.unity.render-pipelines.core/Runtime/Debugging/DebugUI.Fields.cs
@@ -320,6 +320,9 @@ internal void InitQuickSeparators()
 
             internal void InitIndexes()
             {
+                if (enumNames == null)
+                    enumNames = new GUIContent[0];
+
                 indexes = new int[enumNames.Length];
                 for (int i = 0; i < enumNames.Length; i++)
                 {
diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index d050c38c362..cf1956cffbb 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -591,6 +591,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed depth prepass and postpass being disabled after changing the shader in the material UI.
 - Fixed issue with sceneview camera settings not being saved after Editor restart.
 - Fixed issue when switching back to custom sensor type in physical camera settings (case 1244350).
+- Fixed a null ref exception when running playmode tests with the render pipeline debug window opened.
 
 ### Changed
 - Improve MIP selection for decals on Transparents