diff --git a/app/src/main/java/io/github/chronosx88/influence/logic/SettingsLogic.kt b/app/src/main/java/io/github/chronosx88/influence/logic/SettingsLogic.kt
index e324a34..e0a7899 100644
--- a/app/src/main/java/io/github/chronosx88/influence/logic/SettingsLogic.kt
+++ b/app/src/main/java/io/github/chronosx88/influence/logic/SettingsLogic.kt
@@ -4,7 +4,9 @@ import android.util.Log
 import io.github.chronosx88.influence.contracts.CoreContracts
 import io.github.chronosx88.influence.helpers.AppHelper
 import io.github.chronosx88.influence.helpers.KeyPairManager
+import io.github.chronosx88.influence.helpers.ObservableUtils
 import io.github.chronosx88.influence.helpers.P2PUtils
+import io.github.chronosx88.influence.helpers.actions.UIActions
 import net.tomp2p.peers.Number640
 import net.tomp2p.storage.Data
 import java.io.IOException
@@ -12,6 +14,10 @@ import java.io.IOException
 class SettingsLogic : CoreContracts.ISettingsLogic {
 
     override fun checkUsernameExists(username: String) : Boolean {
+        if (AppHelper.getPeerDHT() == null) {
+            ObservableUtils.notifyUI(UIActions.NODE_IS_OFFLINE)
+            return false
+        }
         val usernameMap: MutableMap<Number640, Data>? = P2PUtils.get(username)
         usernameMap ?: return false
         return true
@@ -22,6 +28,10 @@ class SettingsLogic : CoreContracts.ISettingsLogic {
         private val keyPairManager = KeyPairManager()
 
         fun publishUsername(oldUsername: String?, username: String?) {
+            if (AppHelper.getPeerDHT() == null) {
+                ObservableUtils.notifyUI(UIActions.NODE_IS_OFFLINE)
+                return
+            }
             val mainKeyPair = keyPairManager.openMainKeyPair()
             oldUsername?.let {
                 if(!oldUsername.equals("")) {