EndLayoutGroup exception is thrown when tweaking any property in "UIElement Debugger window"

Steps to Repro:
1. Create a new project.
2. Click on Window > Analysis > UIElements Debugger.
3. Select any tab from tab selector drop-down.
4. Change any property.

Actual result:
Observe "EndLayoutGroup" exception is thrown on the console.

Environment:
Windows 10, Windows 7, Mac 10.12, Mac 10.13

Occurring with:
2018.3.0a6

Stack trace:
EndLayoutGroup: BeginLayoutGroup must be called first.
UnityEngine.GUIUtility:ProcessEvent(Int32, IntP