diff --git a/handler/tool.go b/handler/tool.go
index b9820d5..4b52c6a 100644
--- a/handler/tool.go
+++ b/handler/tool.go
@@ -165,6 +165,7 @@ func subscribeAndHandleMessagesV3(ws *websocket.Conn, device_id int) {
 	for {
 		//从service获取当前帧
 		img, c := service.GetDeviceCurrentFrame(device_id)
+		c = count
 		if c != count {
 			//将img转[]byte
 			if img.Empty() {