diff --git a/uikit/src/main/java/com/sendbird/uikit/fragments/ChannelFragment.java b/uikit/src/main/java/com/sendbird/uikit/fragments/ChannelFragment.java
index bd263929..462cf897 100644
--- a/uikit/src/main/java/com/sendbird/uikit/fragments/ChannelFragment.java
+++ b/uikit/src/main/java/com/sendbird/uikit/fragments/ChannelFragment.java
@@ -1815,7 +1815,9 @@ public List<Member> getMembers() {
     public void onPhonebookUpdated() {
         Handler handler = new Handler(getContext().getMainLooper());
         handler.post(() -> {
-            binding.chvChannelHeader.getTitleTextView().setText(ChannelUtils.makeTitleText(channel));
+            if (channel != null) {
+                binding.chvChannelHeader.getTitleTextView().setText(ChannelUtils.makeTitleText(channel));
+            }
         });
     }
 
diff --git a/uikit/src/main/java/com/sendbird/uikit/widgets/NickNameTextView.java b/uikit/src/main/java/com/sendbird/uikit/widgets/NickNameTextView.java
index 7dd0de68..9c0b382b 100644
--- a/uikit/src/main/java/com/sendbird/uikit/widgets/NickNameTextView.java
+++ b/uikit/src/main/java/com/sendbird/uikit/widgets/NickNameTextView.java
@@ -50,8 +50,10 @@ public void setSenderName(Sender sender) {
     private void refreshSenderName() {
         Handler handler = new Handler(getContext().getMainLooper());
         handler.post(() -> {
-            String nickname = UserUtils.getDisplayName(getContext(), sender);
-            setText(nickname);
+            if (sender != null) {
+                String nickname = UserUtils.getDisplayName(getContext(), sender);
+                setText(nickname);
+            }
         });
     }