Before music initialization, call setEffectsVolume will caused an Error---this.music is null

[tangkaikk]

Cocos Creator version

2.4.12, 2.4.13

System information

taobaominigame simulator

Issue description

error:
Uncaught TypeError: Cannot read properties of null (reading 'id')
at Object.setEffectsVolume (adapter.js:6947:26)
at audio.setEffectVolume (index.js:126:24)
at proto.emit (cocos2d-js.js:42020:12)
at _Class2.emit (cocos2d-js.js:16212:7)
at _Class2._emitSlideEvent (cocos2d-js.js:30158:7)
at _Class2._handleSliderLogic (cocos2d-js.js:30154:7)
at _Class2._onTouchMoved (cocos2d-js.js:30139:9)
at proto.emit (cocos2d-js.js:42020:12)
at _doDispatchEvent (cocos2d-js.js:15347:56)
at _Class2.dispatchEvent (cocos2d-js.js:16216:9)

code:
setEffectsVolume: function setEffectsVolume(volume) {
volume = handleVolume(volume);
var musicId = this._music.id;
this._effectVolume = volume;

for (var id in _id2audio) {
  var audio = _id2audio[id];
  if (!audio || audio.id === musicId) continue;
  audio.setVolume(volume);
}

},

Reason:
Before music initialization, i called setEffectsVolume , and then caused the Error. I found that there was an object this._music was null. and I changed the code from "this._music.id;" to "this._music.id?this._music.id:-1;", the error had dissappear.

Relevant error log output

Uncaught TypeError: Cannot read properties of null (reading 'id') at Object.setEffectsVolume (adapter.js:6947:26) at audio.setEffectVolume (index.js:126:24) at proto.emit (cocos2d-js.js:42020:12) at _Class2.emit (cocos2d-js.js:16212:7) at _Class2._emitSlideEvent (cocos2d-js.js:30158:7) at _Class2._handleSliderLogic (cocos2d-js.js:30154:7) at _Class2._onTouchMoved (cocos2d-js.js:30139:9) at proto.emit (cocos2d-js.js:42020:12) at _doDispatchEvent (cocos2d-js.js:15347:56) at _Class2.dispatchEvent (cocos2d-js.js:16216:9)

  | setEffectsVolume | @ | adapter.js:6947 -- | -- | -- | --   | audio.setEffectVolume | @ | index.js:126   | proto.emit | @ | cocos2d-js.js:42020   | emit | @ | cocos2d-js.js:16212   | _emitSlideEvent | @ | cocos2d-js.js:30158   | _handleSliderLogic | @ | cocos2d-js.js:30154   | _onTouchMoved | @ | cocos2d-js.js:30139   | proto.emit | @ | cocos2d-js.js:42020   | _doDispatchEvent | @ | cocos2d-js.js:15347   | dispatchEvent | @ | cocos2d-js.js:16216   | _touchMoveHandler | @ | cocos2d-js.js:15228   | _onTouchEventCallback | @ | cocos2d-js.js:32783   | _dispatchEventToListeners | @ | cocos2d-js.js:32871   | _dispatchTouchEvent | @ | cocos2d-js.js:32820   | dispatchEvent | @ | cocos2d-js.js:33072   | handleTouchesMove | @ | cocos2d-js.js:39874   | (anonymous) | @ | adapter.js:1342   | (anonymous) | @ | vuedomapi.js:2   | F.moveListener | @ | vuedomapi.js:2   | dispatchEvent | @ | adapter.js:5907   | canvas1.dispatchEvent | @ | adapter.js:4794   | triggerTouch | @ | unknown   | (anonymous) | @ | unknown

Steps to reproduce

1.launch application 2,slide the slider

Minimal reproduction project

audio error demo.zip