The samples in question are WebVR Lab and WebVr Orange Room. Recently, when launching these from the editor, an error message is displayed:
[web-vr-ui.js?id=6076849&branchId=2377bd1c-2001-4f78-9f0c-62cc0bee56fb:76]: Cannot read property 'isSupported' of null
TypeError: Cannot read property 'isSupported' of null
at onEnterVrPressedEvent (https://launch.playcanvas.com/api/assets/files/scripts/web-vr-ui.js?id=6076849&branchId=2377bd1c-2001-4f78-9f0c-62cc0bee56fb:76:33)
at script.WebVrUi.initialize (https://launch.playcanvas.com/api/assets/files/scripts/web-vr-ui.js?id=6076849&branchId=2377bd1c-2001-4f78-9f0c-62cc0bee56fb:102:9)
at ScriptComponent._scriptMethod (https://code.playcanvas.com/playcanvas-stable.dbg.js:27162:21)
at ScriptComponent._onInitialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:27180:16)
at ScriptComponentSystem._callComponentMethod (https://code.playcanvas.com/playcanvas-stable.dbg.js:27580:51)
at ScriptComponentSystem._onInitialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:27585:10)
at Function._helper (https://code.playcanvas.com/playcanvas-stable.dbg.js:24278:14)
at Function.initialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:24281:10)
at Application.start (https://code.playcanvas.com/playcanvas-stable.dbg.js:23704:24)
at https://launch.playcanvas.com/editor/scene/js/launch.js:7241:25
Tested in Chrome, Windows 10, no VR hardware connected.