Trouble at exported game as Html5 game in Godot 2.0.2

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:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By arutsu
:warning: Old Version Published before Godot 3 was released.

I exported the demo project “Platformer” as a HTML5 game, and test it by firefox and node-webkit. In firefox I got the “TypeError: _as_voices[$0] is null” error , when in node-webkit the problems was :

Uncaught InvalidStateError: Failed to execute 'stop' on 'AudioBufferSourceNode': cannot call stop without calling start first.
2daction.html:331 exception thrown: InvalidStateError: Failed to execute 'stop' on 'AudioBufferSourceNode': cannot call stop without calling start first.,Error: Failed to execute 'stop' on 'AudioBufferSourceNode': cannot call stop without calling start first.
    at Error (native)
    at Array._as_voice_gain.(anonymous function).gain.value (file:///E:/output/2daction.js:1:24487)
    at _emscripten_asm_const_iiiiiiddi (file:///E:/output/2daction.js:1:26670)
    at Array.ek (file:///E:/output/2daction.js:18:51817)
    at Array.HYc (file:///E:/output/2daction.js:8:157257)
    at Array.FYc (file:///E:/output/2daction.js:8:155157)
    at Array.GJf (file:///E:/output/2daction.js:14:98991)
    at fHg (file:///E:/output/2daction.js:24:272009)
    at ln (file:///E:/output/2daction.js:18:314585)
    at Array.ao (file:///E:/output/2daction.js:18:477064)

In firefox the game can work still ,with a alert dialog showed in the middle of the screen, but would crash in node-webkit.
By the way , the exported html5 game cost a lot of time to load.