diff --git a/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationActivity.java b/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationActivity.java
index 1487995d0..72b92d9f3 100644
--- a/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationActivity.java
+++ b/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationActivity.java
@@ -79,6 +79,9 @@ private void showConversationInfo() {
     protected void onNewIntent(Intent intent) {
         super.onNewIntent(intent);
         conversation = intent.getParcelableExtra("conversation");
+        if (conversation == null) {
+            finish();
+        }
         long initialFocusedMessageId = intent.getLongExtra("toFocusMessageId", -1);
         String channelPrivateChatUser = intent.getStringExtra("channelPrivateChatUser");
         conversationFragment.setupConversation(conversation, null, initialFocusedMessageId, channelPrivateChatUser);
diff --git a/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationFragment.java b/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationFragment.java
index 40d94b3ae..d76c79fab 100644
--- a/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationFragment.java
+++ b/chat/kit/src/main/java/cn/wildfire/chat/kit/conversation/ConversationFragment.java
@@ -300,23 +300,22 @@ public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
 
         inputPanel.init(this, rootLinearLayout);
         inputPanel.setOnConversationInputPanelStateChangeListener(this);
+
+        settingViewModel = ViewModelProviders.of(this).get(SettingViewModel.class);
+        conversationViewModel = WfcUIKit.getAppScopeViewModel(ConversationViewModel.class);
+        conversationViewModel.clearConversationMessageLiveData().observeForever(clearConversationMessageObserver);
+        messageViewModel = ViewModelProviders.of(this).get(MessageViewModel.class);
+
+        messageViewModel.messageLiveData().observeForever(messageLiveDataObserver);
+        messageViewModel.messageUpdateLiveData().observeForever(messageUpdateLiveDatObserver);
+        messageViewModel.messageRemovedLiveData().observeForever(messageRemovedLiveDataObserver);
+        messageViewModel.mediaUpdateLiveData().observeForever(mediaUploadedLiveDataObserver);
+
+        userViewModel = ViewModelProviders.of(this).get(UserViewModel.class);
+        userViewModel.userInfoLiveData().observeForever(userInfoUpdateLiveDataObserver);
     }
 
     private void setupConversation(Conversation conversation) {
-        if (conversationViewModel == null) {
-            settingViewModel = ViewModelProviders.of(this).get(SettingViewModel.class);
-            conversationViewModel = WfcUIKit.getAppScopeViewModel(ConversationViewModel.class);
-            conversationViewModel.clearConversationMessageLiveData().observeForever(clearConversationMessageObserver);
-            messageViewModel = ViewModelProviders.of(this).get(MessageViewModel.class);
-
-            messageViewModel.messageLiveData().observeForever(messageLiveDataObserver);
-            messageViewModel.messageUpdateLiveData().observeForever(messageUpdateLiveDatObserver);
-            messageViewModel.messageRemovedLiveData().observeForever(messageRemovedLiveDataObserver);
-            messageViewModel.mediaUpdateLiveData().observeForever(mediaUploadedLiveDataObserver);
-
-            userViewModel = ViewModelProviders.of(this).get(UserViewModel.class);
-            userViewModel.userInfoLiveData().observeForever(userInfoUpdateLiveDataObserver);
-        }
 
         if (conversation.type == Conversation.ConversationType.Group) {
             GroupViewModel groupViewModel = ViewModelProviders.of(this).get(GroupViewModel.class);
@@ -680,6 +679,9 @@ private void updateTypingStatusTitle(TypingMessageContent typingMessageContent)
     private Runnable resetConversationTitleRunnable = this::resetConversationTitle;
 
     private void resetConversationTitle() {
+        if (getActivity() == null || getActivity().isFinishing()) {
+            return;
+        }
         if (!TextUtils.equals(conversationTitle, getActivity().getTitle())) {
             setActivityTitle(conversationTitle);
             handler.removeCallbacks(resetConversationTitleRunnable);