diff --git a/README.md b/README.md
index 86e25817..f41cff6b 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,7 @@ Second, you need to add SDK dependencies inside your app .gradle. Then, you need
 ```
 dependencies { 
        ... 
-       implementation 'com.qiscus.sdk:chat-core:1.8.3'
+       implementation 'com.qiscus.sdk:chat-core:1.8.4'
 }
 ```
 
diff --git a/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusAppComponent.java b/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusAppComponent.java
index 548b3485..8fe726a9 100644
--- a/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusAppComponent.java
+++ b/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusAppComponent.java
@@ -5,8 +5,10 @@
 
 import com.qiscus.sdk.chat.core.data.local.QiscusDataBaseHelper;
 import com.qiscus.sdk.chat.core.data.local.QiscusDataStore;
+import com.qiscus.sdk.chat.core.event.QiscusInitWithCustomServerEvent;
 import com.qiscus.sdk.chat.core.util.QiscusTextUtil;
 
+import org.greenrobot.eventbus.EventBus;
 import org.json.JSONObject;
 
 import java.util.concurrent.ScheduledThreadPoolExecutor;
@@ -68,6 +70,7 @@ public synchronized void setup(Application application, String qiscusAppId, Stri
         //this.chatConfig = new QiscusCoreChatConfig();
         this.dataStore = new QiscusDataBaseHelper(application);
         QiscusTextUtil.createInstance(application);
+        EventBus.getDefault().post((QiscusInitWithCustomServerEvent.wasSetup));
     }
 
     public synchronized Application getApplication() {
diff --git a/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusCore.java b/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusCore.java
index 81346cbb..4f20b2ec 100644
--- a/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusCore.java
+++ b/chat-core/src/main/java/com/qiscus/sdk/chat/core/QiscusCore.java
@@ -42,7 +42,9 @@
 import com.qiscus.sdk.chat.core.data.model.QiscusRefreshToken;
 import com.qiscus.sdk.chat.core.data.remote.QiscusApi;
 import com.qiscus.sdk.chat.core.data.remote.QiscusPusherApi;
+import com.qiscus.sdk.chat.core.event.QiscusInitWithCustomServerEvent;
 import com.qiscus.sdk.chat.core.event.QiscusRefreshTokenEvent;
+import com.qiscus.sdk.chat.core.event.QiscusSyncEvent;
 import com.qiscus.sdk.chat.core.event.QiscusUserEvent;
 import com.qiscus.sdk.chat.core.service.QiscusNetworkCheckerJobService;
 import com.qiscus.sdk.chat.core.service.QiscusSyncJobService;
@@ -415,8 +417,12 @@ public static void stopSyncService() {
      * start network checker job service if in oreo or higher
      */
     private static void startNetworkCheckerService() {
-        if (BuildVersionUtil.isOreoOrHigher()) {
-            QiscusNetworkCheckerJobService.scheduleJob(getApps());
+        if (appComponent.getAppServer() != null) {
+            if (BuildVersionUtil.isOreoOrHigher()) {
+                QiscusNetworkCheckerJobService.scheduleJob(getApps());
+            }
+        }else{
+            EventBus.getDefault().post((QiscusInitWithCustomServerEvent.notSetup));
         }
     }
 
diff --git a/chat-core/src/main/java/com/qiscus/sdk/chat/core/event/QiscusInitWithCustomServerEvent.java b/chat-core/src/main/java/com/qiscus/sdk/chat/core/event/QiscusInitWithCustomServerEvent.java
new file mode 100644
index 00000000..960f8be2
--- /dev/null
+++ b/chat-core/src/main/java/com/qiscus/sdk/chat/core/event/QiscusInitWithCustomServerEvent.java
@@ -0,0 +1,5 @@
+package com.qiscus.sdk.chat.core.event;
+
+public enum QiscusInitWithCustomServerEvent {
+   notSetup, wasSetup
+}
diff --git a/chat-core/src/main/java/com/qiscus/sdk/chat/core/util/QiscusLogger.java b/chat-core/src/main/java/com/qiscus/sdk/chat/core/util/QiscusLogger.java
index dbea750c..51dd014c 100644
--- a/chat-core/src/main/java/com/qiscus/sdk/chat/core/util/QiscusLogger.java
+++ b/chat-core/src/main/java/com/qiscus/sdk/chat/core/util/QiscusLogger.java
@@ -5,6 +5,8 @@
 
 import com.qiscus.sdk.chat.core.QiscusCore;
 
+import java.util.concurrent.Executors;
+
 /**
  * Created on : November 02, 2017
  * Author     : adicatur
@@ -21,7 +23,7 @@ public static void print(String message) {
     }
 
     public static void print(String tag, String message) {
-        QiscusAndroidUtil.runOnBackgroundThread(() -> {
+        Executors.newSingleThreadExecutor().execute(() -> {
             if (QiscusCore.getChatConfig().isEnableLog()) {
                 Log.d(tag, message);
             }
diff --git a/docs/index.md b/docs/index.md
index 9a0e27c1..e7464935 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -80,7 +80,7 @@ Secondly, you need to add SDK dependencies inside your app .gradle. Then, you ne
 ```
 dependencies {
     ...
-    implementation 'com.qiscus.sdk:chat-core:1.8.3'
+    implementation 'com.qiscus.sdk:chat-core:1.8.4'
 }
 ```
 
diff --git a/gradle.properties b/gradle.properties
index ff689142..c92e4a9b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -43,7 +43,7 @@ chatVersionPatch=0
 # === qiscus chat-core library version ===
 chatCoreVersionMajor=1
 chatCoreVersionMinor=8
-chatCoreVersionPatch=3
+chatCoreVersionPatch=4
 
 # === qiscus default base url
 BASE_URL_SERVER="https://api.qiscus.com/"
@@ -59,7 +59,7 @@ android.useAndroidX=true
 
 libraryGroupId=com.qiscus.sdk
 libraryArtifactId=chat-core
-libraryVersion=1.8.3
+libraryVersion=1.8.4
 
 libraryGroupIdChat=com.qiscus.sdk
 libraryArtifactIdChat=chat