diff --git a/app/src/main/java/com/ericsson/uecontrol/core/logic/UeBehaviourSynchronize.java b/app/src/main/java/com/ericsson/uecontrol/core/logic/UeBehaviourSynchronize.java
index 05467d3..46e0bac 100755
--- a/app/src/main/java/com/ericsson/uecontrol/core/logic/UeBehaviourSynchronize.java
+++ b/app/src/main/java/com/ericsson/uecontrol/core/logic/UeBehaviourSynchronize.java
@@ -105,7 +105,7 @@ public class UeBehaviourSynchronize extends UeBehaviour implements BluetoothClie
         }
     }
 
-    public void close(){
+    public synchronized void close(){
         if(client != null){
             client.close();
             client = null;