diff --git a/app/src/main/java/io/github/chronosx88/influence/helpers/actions/UIActions.java b/app/src/main/java/io/github/chronosx88/influence/helpers/actions/UIActions.java
index b791d6f..208f7c7 100644
--- a/app/src/main/java/io/github/chronosx88/influence/helpers/actions/UIActions.java
+++ b/app/src/main/java/io/github/chronosx88/influence/helpers/actions/UIActions.java
@@ -11,4 +11,5 @@ public class UIActions {
     public static final int PEER_NOT_EXIST = 0x7;
     public static final int SUCCESSFUL_CREATE_CHAT = 0x8;
     public static final int MESSAGE_RECEIVED = 0x9;
+    public static final int NODE_IS_OFFLINE = 0x10;
 }
diff --git a/app/src/main/java/io/github/chronosx88/influence/logic/ChatLogic.java b/app/src/main/java/io/github/chronosx88/influence/logic/ChatLogic.java
index 42a607e..adc2303 100644
--- a/app/src/main/java/io/github/chronosx88/influence/logic/ChatLogic.java
+++ b/app/src/main/java/io/github/chronosx88/influence/logic/ChatLogic.java
@@ -46,12 +46,18 @@ public class ChatLogic implements IChatLogicContract {
             }
         };
         this.timer = new Timer();
-        timer.schedule(timerTask, 1, 1000);
+        if(AppHelper.getPeerDHT() != null) {
+            timer.schedule(timerTask, 1, 1000);
+        }
         this.keyPairManager = new KeyPairManager();
     }
 
     @Override
     public void sendMessage(MessageEntity message) {
+        if(AppHelper.getPeerDHT() == null) {
+            ObservableUtils.notifyUI(UIActions.NODE_IS_OFFLINE);
+            return;
+        }
         new Thread(() -> {
             Data data = null;
             try {
diff --git a/app/src/main/java/io/github/chronosx88/influence/logic/MainLogic.java b/app/src/main/java/io/github/chronosx88/influence/logic/MainLogic.java
index 3d3624a..eea2263 100644
--- a/app/src/main/java/io/github/chronosx88/influence/logic/MainLogic.java
+++ b/app/src/main/java/io/github/chronosx88/influence/logic/MainLogic.java
@@ -249,8 +249,7 @@ public class MainLogic implements IMainLogicContract {
         Data serializedUserProfile = null;
         try {
             serializedUserProfile = new Data(gson.toJson(userProfile))
-                    .protectEntry(mainKeyPair.getPrivate())
-                    .sign(keyPairManager.getKeyPair("mainSigningKeyPair"));
+                    .protectEntry(mainKeyPair.getPrivate());
         } catch (IOException e) {
             e.printStackTrace();
         }
diff --git a/app/src/main/java/io/github/chronosx88/influence/logic/StartChatLogic.java b/app/src/main/java/io/github/chronosx88/influence/logic/StartChatLogic.java
index 58a89b7..0474355 100644
--- a/app/src/main/java/io/github/chronosx88/influence/logic/StartChatLogic.java
+++ b/app/src/main/java/io/github/chronosx88/influence/logic/StartChatLogic.java
@@ -38,6 +38,11 @@ public class StartChatLogic implements IStartChatLogicContract {
 
     @Override
     public void sendStartChatMessage(String peerID) {
+        if(peerDHT == null) {
+            ObservableUtils.notifyUI(UIActions.NODE_IS_OFFLINE);
+            return;
+        }
+
         new Thread(() -> {
             PublicUserProfile recipientPublicProfile = getPublicProfile(peerID);
             if(recipientPublicProfile == null) {
diff --git a/app/src/main/java/io/github/chronosx88/influence/presenters/ChatPresenter.java b/app/src/main/java/io/github/chronosx88/influence/presenters/ChatPresenter.java
index 9cd991c..4c049f8 100644
--- a/app/src/main/java/io/github/chronosx88/influence/presenters/ChatPresenter.java
+++ b/app/src/main/java/io/github/chronosx88/influence/presenters/ChatPresenter.java
@@ -1,5 +1,7 @@
 package io.github.chronosx88.influence.presenters;
 
+import android.widget.Toast;
+
 import com.google.gson.Gson;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
@@ -54,6 +56,12 @@ public class ChatPresenter implements IChatPresenterContract, IObserver {
                 }
                 MessageEntity messageEntity = LocalDBWrapper.getMessageByID(jsonArray.get(1).getAsString());
                 view.updateMessageList(messageEntity);
+                break;
+            }
+
+            case UIActions.NODE_IS_OFFLINE: {
+                Toast.makeText(AppHelper.getContext(), "Нода не запущена!", Toast.LENGTH_SHORT).show();
+                break;
             }
         }
     }
diff --git a/app/src/main/java/io/github/chronosx88/influence/presenters/StartChatPresenter.java b/app/src/main/java/io/github/chronosx88/influence/presenters/StartChatPresenter.java
index 26f8c82..78c1b78 100644
--- a/app/src/main/java/io/github/chronosx88/influence/presenters/StartChatPresenter.java
+++ b/app/src/main/java/io/github/chronosx88/influence/presenters/StartChatPresenter.java
@@ -40,6 +40,12 @@ public class StartChatPresenter implements IStartChatPresenterContract, IObserve
                 view.showMessage("Чат успешно создан!");
                 break;
             }
+
+            case UIActions.NODE_IS_OFFLINE: {
+                view.showProgressDialog(false);
+                view.showMessage("Нода не запущена!");
+                break;
+            }
         }
     }
 }