[]TypeError: Cannot read property '_byteLength' of null

将帧频降到30帧 已经打开一个dialog 再打开另外一个时就会报错 60帧是不会报错的

Uncaught TypeError: Cannot read property '_byteLength' of null
at WebGLContext2D.__proto.flush (GameLoader.max.js:25474)
at SubmitCanvas.__proto.renderSubmit (GameLoader.max.js:26595)
at WebGLContext2D.__proto.submitElement (GameLoader.max.js:25465)
at WebGLContext2D.__proto.flush (GameLoader.max.js:25487)
at RenderContext.__proto.flush (GameLoader.max.js:11156)
at Stage.__proto.render (GameLoader.max.js:33262)
at Stage.__proto._loop (GameLoader.max.js:33188)
at loop (GameLoader.max.js:10648)