diff --git a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/web/ApiController.java b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/web/ApiController.java
index 9c5ccff0..84fb293b 100644
--- a/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/web/ApiController.java
+++ b/sec-beidou-rtcm/src/main/java/com/imdroid/sideslope/web/ApiController.java
@@ -32,7 +32,7 @@ public class ApiController {
         DeviceChannel deviceChannel = OnlineChannels.INSTANCE.getConfigChannel(deviceId);
         if(deviceChannel == null) deviceChannel = OnlineChannels.INSTANCE.getDataChannel(deviceId);
         //if(deviceChannel!=null && deviceChannel.isOnline()){
-        if(deviceChannel!=null){
+        if(deviceChannel!=null && deviceChannel.isOnline()){
             status.put("status", "Online");
             // send command
             ByteBuf buf = Unpooled.buffer();