优化:避免渲染器像素流错误

src/GraphicsSystem/WebRtcRenderer.ts

@@ -124,6 +124,7 @@ export class WebRtcRenderer
         await Sleep(50);
 
         await this.Connect();
+        if (!this.webRtcPlayerObj) return;
 
         this.webRtcPlayerObj.video.style.position = "absolute";
         this.webRtcPlayerObj.video.style.pointerEvents = "none";