修复已知问题

src/utils/speech.ts

@@ -159,7 +159,9 @@ export const controlMusic = () => {
   if (voiceData != undefined && voiceData == 'false') {
     state = false;
   }
-  myMusic.muted = state ? false : true;
+  if(myMusic){
+    myMusic.muted = state ? false : true;
+  }
 };
 
 //小数播报格式