ArgumentNullException: Value cannot be null error fails on pressing "Copy decompiled code"

To reproduce:
1. Open Editor.
2. Open DOTS -> Dots compiler -> Open Inspector.
3. Press "Copy decompiled code" without choosing anything on the left.

Actual result: Error fails.
ArgumentNullException: Value cannot be null.
Parameter name: value
System.String.Join (System.String separator, System.String[] value) (at <fb001e01371b4adca20013e0ac763896>:0)
Unity.Entities.Editor.PostprocessedILWindow+<>c.<RegisterCallbacks>b__22_0 () (at Library/PackageCache/com.unity.entities@0.11.0-preview.7/Unity.Entities.Editor/PostprocessedILInspector/PostprocessedILWindow.cs:98)
UnityEngine.UIElements.Clickable.Invoke (UnityEngine.UIElements.EventBase evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.Clickable.ProcessUpEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.Vector2 localPosition, System.Int32 pointerId) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.Clickable.OnMouseUp (UnityEngine.UIElements.MouseUpEvent evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventCallbackFunctor`1[TEventType].Invoke (UnityEngine.UIElements.EventBase evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventCallbackRegistry.InvokeCallbacks (UnityEngine.UIElements.EventBase evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEvent (UnityEngine.UIElements.EventBase evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.CallbackEventHandler.HandleEventAtTargetPhase (UnityEngine.UIElements.EventBase evt) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.ApplyDispatchingStrategies (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, System.Boolean imguiEventIsInitiallyUsed) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEventQueue () (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.OpenGate () (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcherGate.Dispose () (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <68fea2b4ed6d49f7a2269f0399bfcd28>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <548becff340d43eb8476c04a50118d51>:0)