diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/models/BulletsManager.java b/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/models/BulletsManager.java
index f619b03..28e3d06 100644
--- a/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/models/BulletsManager.java
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/models/BulletsManager.java
@@ -44,6 +44,7 @@
         this.resources = fragment;
     }
 
+    @Override
     public void setInstanceId(String id) {
         this.instanceId = id;
     }
@@ -61,7 +62,7 @@
     @Override
     public void update(double interval) {
         nextConnectRenaimdTime -= interval;
-        if (nextConnectRenaimdTime <= 0) {
+        if (nextConnectRenaimdTime <= 0 && instanceId != null) {
             nextConnectRenaimdTime = CONNECT_INTERVAL;
             con = new BulletGetConnection(instanceId);
             con.setCallBack(this);