diff --git a/src/component/internal/webrtc.ts b/src/component/internal/webrtc.ts
index 926faec0..4c71c34a 100644
--- a/src/component/internal/webrtc.ts
+++ b/src/component/internal/webrtc.ts
@@ -207,12 +207,10 @@ export class NekoWebRTC extends EventEmitter<NekoWebRTCEvents> {
         break
       default:
         this._log.warn(`unknown data event: ${event}`)
+        return
     }
 
-    // @ts-ignore
-    if (typeof buffer !== 'undefined') {
-      this._channel!.send(buffer)
-    }
+    this._channel!.send(buffer)
   }
 
   // not-implemented
@@ -250,6 +248,7 @@ export class NekoWebRTC extends EventEmitter<NekoWebRTCEvents> {
 
     if (this._statsStop && typeof this._statsStop === 'function') {
       this._statsStop()
+      this._statsStop = undefined
     }
   }
 
diff --git a/src/component/main.vue b/src/component/main.vue
index 3cdb4ec2..3d67112d 100644
--- a/src/component/main.vue
+++ b/src/component/main.vue
@@ -203,7 +203,7 @@
         throw new Error('client not connected to websocket')
       }
 
-      this.websocket.disconnect()
+      this.websocket.disconnect(new Error('manual action'))
     }
 
     public webrtcConnect() {
@@ -361,7 +361,7 @@
         this.webrtc.disconnect()
         this.clearState()
 
-        // reconnect WebRTC
+        // reconnect Websocket
         if (this.authenticated) {
           setTimeout(() => {
             try {