update

src/components/RTC/PageRtcLive.vue

@@ -675,8 +675,8 @@ let onfollowData = (data) => {
   }
 };
 
-let onfollowPaint = (data) => {
-  canUndo.value = app.Connect.paint.records.length > 0;
+let onfollowPaint =async (data) => {
+  canUndo.value = await getApp().Connect.paint.records.length > 0;
   socket.value.emit("paint", data);
 };