Cannot read property 'isSupported' of null

Help & Support
1

I want to make 2 modes: VR and normal in mobile
I have web-vr-ui.js which is added to the Root entity.
What should i do with bellow error?


[web-vr-ui.js?id=12417324:64]: Cannot read property 'isSupported' of null

TypeError: Cannot read property 'isSupported' of null
    at onEnterVrPressedEvent (https://launch.playcanvas.com/api/assets/files/scripts/vr/web-vr-ui.js?id=12417324:64:33)
    at script.WebVrUi.initialize (https://launch.playcanvas.com/api/assets/files/scripts/vr/web-vr-ui.js?id=12417324:81:5)
    at Func._scriptMethod (https://code.playcanvas.com/playcanvas-stable.dbg.js:24910:21)
    at Func._onInitialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:24928:16)
    at Func._callComponentMethod (https://code.playcanvas.com/playcanvas-stable.dbg.js:25186:32)
    at Func._onInitialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:25212:10)
    at Function.fire (https://code.playcanvas.com/playcanvas-stable.dbg.js:624:18)
    at Function.initialize (https://code.playcanvas.com/playcanvas-stable.dbg.js:22281:21)
    at Application.start (https://code.playcanvas.com/playcanvas-stable.dbg.js:21820:24)
    at https://launch.playcanvas.com/editor/scene/js/launch.js:6868:25