diff --git a/tools/cooja/apps/serial_socket/java/org/contikios/cooja/serialsocket/SerialSocketServer.java b/tools/cooja/apps/serial_socket/java/org/contikios/cooja/serialsocket/SerialSocketServer.java
index fa55da74b..e73eac513 100644
--- a/tools/cooja/apps/serial_socket/java/org/contikios/cooja/serialsocket/SerialSocketServer.java
+++ b/tools/cooja/apps/serial_socket/java/org/contikios/cooja/serialsocket/SerialSocketServer.java
@@ -644,6 +644,7 @@ public class SerialSocketServer extends VisPlugin implements MotePlugin {
   private Timer updateTimer = new Timer(UPDATE_INTERVAL, new ActionListener() {
     @Override
 	  public void actionPerformed(ActionEvent e) {
+	  	if (Cooja.isVisualized()) {
 		  if (closed) {
 			  updateTimer.stop();
 			  return;
@@ -652,6 +653,7 @@ public class SerialSocketServer extends VisPlugin implements MotePlugin {
 		  socketToMoteLabel.setText(inBytes + " bytes");
 		  moteToSocketLabel.setText(outBytes + " bytes");
 	  }
+	  }
   });
 }