TypeError: Cannot read property ‘destroy’ of null
GameUi.ts:120
at GameUi.start (f:\kvirus\assets\scripts\UI\GameUi.ts:120:35)
at CCClass.eval [as _invoke] (eval at createInvokeImpl (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:11891:51), 
65)
at CCClass.invoke (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:11833:14)
at CCClass.startPhase (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:11973:27)
at 27.cc.Director.mainLoop (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:7072:33)
at callback (http://localhost:7456/app/engine/bin/cocos2d-js-for-preview.js:7311:22)
